123-480: The Malaysia Junior Hockey League (MJHL) is a top junior league competition for junior field hockey clubs in the Malaysian hockey system. At present also it is sponsored by Milo and National Sports Council . A record 27 teams will feature in the 2014 Malaysian Junior Hockey League. The tournament was initiated to revive interest in the sport which was losing spectator interest to football in recent times. Hockey
246-424: A glass with no true melting point, can be used as a glass fiber for fiberglass but has the drawback that it must be worked at very high temperatures. In order to lower the necessary work temperature, other materials are introduced as "fluxing agents" (i.e., components to lower the melting point). Ordinary A-glass ("A" for "alkali-lime") or soda lime glass, crushed and ready to be remelted, as so-called cullet glass,
369-539: A 5 mg/m total limit. As of 2001, the Hazardous Substances Ordinance in Germany dictates a maximum occupational exposure limit of 86 mg/m . In certain concentrations, a potentially explosive mixture may occur. Further manufacture of GRP components (grinding, cutting, sawing) creates fine dust and chips containing glass filaments, as well as tacky dust, in quantities high enough to affect health and
492-602: A November, 2011 modification to its Proposition 65 listing to include only "Glass wool fibers (inhalable and biopersistent)." Therefore a cancer warning label for biosoluble fiber glass home and building insulation is no longer required under federal or California law. As of 2012, the North American Insulation Manufacturers Association stated that fiberglass is safe to manufacture, install and use when recommended work practices are followed to reduce temporary mechanical irritation. As of 2012,
615-535: A backboard, which stand 50 cm (20 in) from the ground. The backboard runs the full 3.66 m (12.0 ft) width of the goal, while the sideboards are 1.2 m (3 ft 11 in) deep. Historically the game developed on natural grass turf. In the early 1970s, synthetic grass fields began to be used for hockey, with the first Olympic Games on this surface being held at Montreal in 1976 . Synthetic pitches are now mandatory for all international tournaments and for most national competitions. While hockey
738-521: A ball to the opponents' goal, date at least as far back as the Early Middle Ages . By the 12th century, a team ball game called la soule or choule , akin to a chaotic and sometimes long-distance version of hockey or rugby football (depending on whether sticks were used in a particular local variant), was regularly played in France and southern Britain between villages or parishes. Throughout
861-439: A binder. It is typically processed using the hand lay-up technique, where sheets of material are placed on a mold and brushed with resin. Because the binder dissolves in resin, the material easily conforms to different shapes when wetted out. After the resin cures, the hardened product can be taken from the mold and finished. Using chopped strand mat gives the fiberglass isotropic in-plane material properties. A coating or primer
984-417: A chemical solution. The individual filaments are now bundled in large numbers to provide a roving . The diameter of the filaments, and the number of filaments in the roving, determine its weight , typically expressed in one of two measurement systems: These rovings are then either used directly in a composite application such as pultrusion , filament winding (pipe), gun roving (where an automated gun chops
1107-401: A combined stream from a chopper gun. Workers roll out the spray-up to compact the laminate. Wood, foam or other core material may then be added, and a secondary spray-up layer imbeds the core between the laminates. The part is then cured, cooled, and removed from the reusable mold. Pultrusion is a manufacturing method used to make strong, lightweight composite materials. In pultrusion, material
1230-399: A defender comes between the player with possession and the ball in order to prevent them tackling; when a defender's stick comes between the attacker's stick and the ball or makes contact with the attacker's stick or body; and also when blocking the opposition's attempt to tackle a teammate with the ball (called third party obstruction ). When the ball passes completely over the sidelines (on
1353-459: A defender out of the way. Field players may not play the ball with their feet, but if the ball accidentally hits the feet, and the player gains no benefit from the contact, then the contact is not penalised. Although there has been a change in the wording of this rule from 1 January 2007, the current FIH umpires' briefing instructs umpires not to change the way they interpret this rule. Obstruction typically occurs in three circumstances – when
SECTION 10
#17330851095461476-592: A different design of stick; they also cannot play the ball with the round side of their stick. The modern game was developed at public schools in 19th-century England and it is now played globally. The governing body is the International Hockey Federation (FIH), called the Fédération Internationale de Hockey in French. Men and women are represented internationally in competitions including
1599-402: A face-off, or non-players waiting for their turn at play). Billiards historians Stein and Rubino believe it was among the games ancestral to lawn-and-field games like hockey and ground billiards , and near-identical depictions appear in later European illuminated manuscripts and other works of the 14th through 17th centuries, showing contemporary courtly and clerical life. In East Asia ,
1722-404: A free hit. (In previous versions of the rules, hits in the area outside the circle in open play have been permitted but lifting one direction from a free hit was prohibited). Opponents must move 5 m (5.5 yd) from the ball when a free hit is awarded. A free hit must be taken from within playing distance of the place of the offence for which it was awarded and the ball must be stationary when
1845-425: A hybrid variety which require less watering. This is due to the negative ecological effects of the high water requirements of water-based synthetic fields. It has also been stated that the decision to make artificial surfaces mandatory greatly favoured more affluent countries who could afford these new pitches. The game is played between two teams of eleven; 10 field players and one goal keeper are permitted to be on
1968-430: A liner to prevent gas leakage or as a barrier to protect the composite from the fluid to be stored. Filament winding is well suited to automation, and there are many applications, such as pipe and small pressure vessels that are wound and cured without any human intervention. The controlled variables for winding are fiber type, resin content, wind angle, tow or bandwidth and thickness of the fiber bundle. The angle at which
2091-451: A long distance When the ball is outside the circle they are defending, goalkeepers or players with goalkeeping privileges are only permitted to play the ball with their stick. Further, a goalkeeper, or player with goalkeeping privileges who is wearing a helmet, must not take part in the match outside the 23m area they are defending, except when taking a penalty stroke. A goalkeeper must wear protective headgear at all times, except when taking
2214-405: A manner which is dangerous to other players by taking advantage of the protective equipment they wear. Neither goalkeepers or players with goalkeeping privileges may lie on the ball, however, they are permitted to use arms, hands and any other part of their body to push the ball away. Lying on the ball deliberately will result in a penalty stroke, whereas if an umpire deems a goalkeeper has lain on
2337-457: A penalty stroke. For the purposes of the rules, all players on the team in possession of the ball are attackers, and those on the team without the ball are defenders, yet throughout the game being played you are always "defending" your goal and "attacking" the opposite goal. The match is officiated by two field umpires . Traditionally each umpire generally controls half of the field, divided roughly diagonally. These umpires are often assisted by
2460-422: A player can exit the field, but you must wait until after the penalty corner is complete. Play is not stopped for a substitution (except of a goalkeeper), the players leave and rejoin the match simultaneously at the half-way line. Players are permitted to play the ball with the flat of the 'face side' and with the edges of the head and handle of the field hockey stick with the exception that, for reasons of safety,
2583-913: A post-exposure recovery period." Historic reviews of the epidemiology studies had been conducted by Harvard's Medical and Public Health Schools in 1995, the National Academy of Sciences in 2000, the Agency for Toxic Substances and Disease Registry ("ATSDR") in 2004, and the National Toxicology Program in 2011. which reached the same conclusion as IARC that there is no evidence of increased risk from occupational exposure to glass wool fibers. Genetic and toxic effects are exerted through production of reactive oxygen species , which can damage DNA, and cause chromosomal aberrations , nuclear abnormalities, mutations, gene amplification in proto-oncogenes , and cell transformation in mammalian cells. There
SECTION 20
#17330851095462706-636: A similar game was entertained, using a carved wooden stick and ball, prior to 300 BC. In Inner Mongolia , China , the Daur people have for about 1,000 years been playing beikou , a game with some similarities to field hockey. A similar field hockey or ground billiards variant, called suigan , was played in China during the Ming dynasty (1368–1644, post-dating the Mongol-led Yuan dynasty ). A game similar to field hockey
2829-429: A technical bench including a timekeeper and record keeper. Prior to the start of the game, a coin is tossed and the winning captain can choose a starting end or whether to start with the ball. Since 2017 the game consists of four periods of 15 minutes with a 2-minute break after every period, and a 15-minute intermission at half time before changing ends. At the start of each period, as well as after goals are scored, play
2952-415: A thermoplastic inner tank which acts as a preform during construction. Much more reliable tanks are made using woven mat or filament wound fiber, with the fiber orientation at right angles to the hoop stress imposed in the sidewall by the contents. Such tanks tend to be used for chemical storage because the plastic liner (often polypropylene ) is resistant to a wide range of corrosive chemicals. Fiberglass
3075-433: A very dynamic style of play, it is difficult to simplify positions to the static formations which are common in association football . Although positions will typically be categorised as either fullback, halfback, midfield/inner or striker, it is important for players to have an understanding of every position on the field. For example, it is not uncommon to see a halfback overlap and end up in either attacking position, with
3198-422: Is a common type of fiber-reinforced plastic using glass fiber . The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth . The plastic matrix may be a thermoset polymer matrix —most often based on thermosetting polymers such as epoxy , polyester resin , or vinyl ester resin —or a thermoplastic . Cheaper and more flexible than carbon fiber , it
3321-427: Is a fabrication technique mainly used for manufacturing open (cylinders) or closed-end structures (pressure vessels or tanks). The process involves winding filaments under tension over a male mandrel. The mandrel rotates while a wind eye on a carriage moves horizontally, laying down fibers in the desired pattern. The most common filaments are carbon or glass fiber and are coated with synthetic resin as they are wound. Once
3444-410: Is also awarded for offences committed by the attacking side within 15 m of the end of the pitch they are attacking. Set plays are often utilised for specific situations such as a penalty corner or free hit. For instance, many teams have penalty corner variations that they can use to beat the defensive team. The coach may have plays that sends the ball between two defenders and lets the player attack
3567-545: Is also indirect, inflammation-driven genotoxicity through reactive oxygen species by inflammatory cells . The longer and thinner as well as the more durable (biopersistent) fibers were, the more potent they were in damage. In the US, fine mineral fiber emissions have been regulated by the EPA , but respirable fibers (“particulates not otherwise regulated”) are regulated by Occupational Safety and Health Administration (OSHA); OSHA has set
3690-413: Is also known as MILO-MJHL Cup due to sponsorship reason. Field hockey Field hockey (or simply hockey ) is a team sport structured in standard hockey format, in which each team plays with 11 players in total, made up of 10 field players and a goalkeeper. Teams must move a hockey ball around a field by hitting it with a hockey stick towards the rival team's shooting circle and then into
3813-432: Is also used for septic tanks . Glass-reinforced plastics are also used to produce house building components such as roofing laminate, door surrounds, over-door canopies, window canopies and dormers, chimneys, coping systems, and heads with keystones and sills. The material's reduced weight and easier handling, compared to wood or metal, allows faster installation. Mass-produced fiberglass brick-effect panels can be used in
Malaysia Junior Hockey League - Misplaced Pages Continue
3936-401: Is applied to the chosen mold to allow the finished product to be cleanly removed from the mold. Resin—typically a 2-part thermoset polyester, vinyl, or epoxy—is mixed with its hardener and applied to the surface. Sheets of fiberglass matting are laid into the mold, then more resin mixture is added using a brush or roller. The material must conform to the mold, and air must not be trapped between
4059-479: Is applied to the roving to help protect the glass filaments for processing and manipulation and to ensure proper bonding to the resin matrix, thus allowing for the transfer of shear loads from the glass fibers to the thermoset plastic. Without this bonding, the fibers can 'slip' in the matrix causing localized failure. An individual structural glass fiber is both stiff and strong in tension and compression —that is, along its axis. Although it might be assumed that
4182-469: Is based on modern translations of the proclamation, which was originally in Latin and explicitly forbade the games "Pilam Manualem, Pedivam, & Bacularem: & ad Canibucam & Gallorum Pugnam". The word baculum is the Latin for ' stick ' , so the reference would appear to be to a game played with sticks. The English historian and biographer John Strype did not use the word hockey when he translated
4305-483: Is called pultrusion . The manufacturing process for glass fibers suitable for reinforcement uses large furnaces to gradually melt the silica sand, limestone , kaolin clay , fluorspar , colemanite , dolomite and other minerals until a liquid forms. It is then extruded through bushings ( spinneret ), which are bundles of very small orifices (typically 5–25 micrometres in diameter for E-Glass, 9 micrometres for S-Glass). These filaments are then sized (coated) with
4428-502: Is considered third party and the ball automatically goes to the team who only had one player involved in the third party. A match ordinarily consists of two periods of 35 minutes and a halftime interval of 5 minutes. Other periods and interval may be agreed by both teams except as specified in regulations for particular competitions. Since 2014, some international games have four 15-minute quarters with 2 minutes break between each quarter and 5 minutes break between quarter two and three. At
4551-579: Is credited with producing the first composite boat in 1937 but did not proceed further at the time because of the brittle nature of the plastic used. In 1939 Russia was reported to have constructed a passenger boat of plastic materials, and the United States a fuselage and wings of an aircraft. The first car to have a fiberglass body was a 1946 prototype of the Stout Scarab , but the model did not enter production. Unlike glass fibers used for insulation, for
4674-401: Is essentially an entire two-dimensional plane; with woven fabrics or unidirectional layers, directionality of stiffness and strength can be more precisely controlled within the plane. A fiberglass component is typically of a thin "shell" construction, sometimes filled on the inside with structural foam, as in the case of surfboards. The component may be of nearly arbitrary shape, limited only by
4797-425: Is not permitted to gain control and continue dribbling. The rules do not allow the person who kicked the ball to gain advantage from the kick, so the ball will automatically be passed on to the opposing team. Conversely, if no advantage is gained from kicking the ball, play should continue. Players may not obstruct another's chance of hitting the ball in any way. No shoving/using your body/stick to prevent advancement in
4920-420: Is now more commonly referred to as the "forehand sweep" where the ball is hit with the flat side or "natural" side of the stick and not the rounded edge. Other rules include; no foot-to-ball contact, no use of hands, no obstructing other players, no high back swing, no hacking, and no third party. If a player is dribbling the ball and either loses control and kicks the ball or another player interferes that player
5043-570: Is one of Malaysia 's major sports. One of the main reasons for the waning popularity of the existing domestic competition was the rise of corporate teams such as Ernst & Young , TNB and Maybank which do not have a steady fan following. MHL is trying to change that by bringing in regional flavour. It fields teams from traditional hockey bastions such as Kuala Lumpur , Penang , other areas, as well as from other places where it has got some fan following. The MHC-Milo-NSC Malaysia Junior Hockey League (MJHL) made its debut in 1995. The competition
Malaysia Junior Hockey League - Misplaced Pages Continue
5166-513: Is pulled through forming machinery using either a hand-over-hand method or a continuous-roller method (as opposed to extrusion , where the material is pushed through dies). In fiberglass pultrusion, fibers (the glass material) are pulled from spools through a device that coats them with a resin. They are then typically heat-treated and cut to length. Fiberglass produced this way can be made in a variety of shapes and cross-sections, such as W or S cross-sections. People can be exposed to fiberglass in
5289-639: Is required, such as equipment cabinets and steel support structures, due to the ease with which it can be molded and painted to blend with existing structures and surfaces. Other uses include sheet-form electrical insulators and structural components commonly found in power-industry products. Because of fiberglass's lightweight and durability, it is often used in protective equipment such as helmets. Many sports use fiberglass protective gear, such as goaltenders' and catchers' masks. Storage tanks can be made of fiberglass with capacities up to about 300 tonnes . Smaller tanks can be made with chopped strand mat cast over
5412-505: Is sometimes referred to as "fiberglass", the composite is also called fiberglass-reinforced plastic ( FRP ). This article uses "fiberglass" to refer to the complete fiber-reinforced composite material, rather than only to the glass fiber within it. Glass fibers have been produced for centuries, but the earliest patent was awarded to the Prussian inventor Hermann Hammesfahr (1845–1914) in the U.S. in 1880. Mass production of glass strands
5535-400: Is started with a pass from the centre of the field. All players must start in their defensive half (apart from the player making the pass), but the ball may be played in any direction along the floor. Each team starts with the ball in one half, and the team that conceded the goal has possession for the restart. Teams trade sides at halftime. Field players may only play the ball with the face of
5658-476: Is still played on traditional grass fields at some local levels and lesser national divisions, it has been replaced by synthetic surfaces almost everywhere in the western world. There are three main types of artificial hockey surface: Since the 1970s, sand-based pitches have been favoured as they dramatically speed up the game. However, in recent years there has been a massive increase in the number of "water-based" artificial turfs. Water-based synthetic turfs enable
5781-635: Is stronger than many metals by weight, non- magnetic , non- conductive , transparent to electromagnetic radiation , can be molded into complex shapes, and is chemically inert under many circumstances. Applications include aircraft, boats, automobiles, bath tubs and enclosures, swimming pools , hot tubs , septic tanks , water tanks , roofing, pipes, cladding, orthopedic casts , surfboards , and external door skins. Other common names for fiberglass are glass-reinforced plastic ( GRP ), glass-fiber reinforced plastic ( GFRP ) or GFK (from German : Glasfaserverstärkter Kunststoff ). Because glass fiber itself
5904-402: Is that the resins used are subject to contraction during the curing process. For polyester this contraction is often 5–6%; for epoxy, about 2%. Because the fibers do not contract, this differential can create changes in the shape of the part during curing. Distortions can appear hours, days, or weeks after the resin has set. While this distortion can be minimized by symmetric use of the fibers in
6027-476: Is used primarily in Canada and the United States, where hockey more often refers to ice hockey . In Sweden and Finland, the term landhockey and maahockey respectively are used, translating to "ground" hockey in opposition to the more standard ice hockey variant. A popular variant is indoor field hockey , which differs in a number of respects while embodying the primary principles of hockey. According to
6150-460: Is used when tensile strength (high modulus) is important and is thus an important building and aircraft epoxy composite (it is called R-glass, "R" for "reinforcement" in Europe). C-glass ("C" for "chemical resistance") and T-glass ("T" is for "thermal insulator"—a North American variant of C-glass) are resistant to chemical attack; both are often found in insulation-grades of blown fiberglass. Fiberglass
6273-433: Is versatile because it is lightweight, strong, weather-resistant, and can have a variety of surface textures. During World War II, fiberglass was developed as a replacement for the molded plywood used in aircraft radomes (fiberglass being transparent to microwaves ). Its first main civilian application was for the building of boats and sports car bodies, where it gained acceptance in the 1950s. Its use has broadened to
SECTION 50
#17330851095466396-591: The Beighton Cup and the Aga Khan tournament commenced within ten years. Entering the Olympics in 1928, India won all five games without conceding a goal, and won from 1932 until 1956 and then in 1964 and 1980. Pakistan won Olympics gold in men's hockey in 1960, 1968 and 1984. In fact, all but three of Pakistan's 11 Olympics medals so far have been in field hockey, including three gold, three silver and two bronze medals. In
6519-592: The Beni Hasan tomb of Khety, an administrator of Dynasty XI . In Ancient Greece , there is a similar image dated c. 510 BC , which may have been called Κερητίζειν ( kerētízein ) because it was played with a horn ( κέρας , kéras in Ancient Greek ) and a ball. Researchers disagree over how to interpret this image. It could have been a team or one-on-one activity (the depiction shows two active players, and other figures who may be team-mates awaiting
6642-564: The International Agency for Research on Cancer (IARC) as "not classifiable as to carcinogenicity to humans" ( IARC group 3 ). "Epidemiologic studies published during the 15 years since the previous IARC monographs review of these fibers in 1988 provide no evidence of increased risks of lung cancer or mesothelioma (cancer of the lining of the body cavities) from occupational exposures during the manufacture of these materials, and inadequate evidence overall of any cancer risk." In June 2011,
6765-542: The International Hockey Federation (FIH), "the roots of hockey are buried deep in antiquity". There are historical records which suggest early forms of hockey were played in Egypt and Persia c. 2000 BC , and in Ethiopia c. 1000 BC . Later evidence suggest that the ancient Greeks, Romans and Aztecs all played hockey-like games. In Ancient Egypt , there is a depiction of two figures playing with sticks and ball in
6888-494: The Irish Hockey Association reported that the gender split among its players was approximately 65% female and 35% male. In its 2008 census, Hockey Australia reported 40,534 male club players and 41,542 female. Most hockey field dimensions were originally fixed using whole numbers of imperial measures . Metric measurements are now the official dimensions as laid down by the International Hockey Federation (FIH) in
7011-543: The Middle Ages to the Early Modern era , such games often involved the local clergy or secular aristocracy , and in some periods were limited to them by various anti-gaming edicts, or even banned altogether. Stein and Rubino, among others, ultimately trace aspects of these games both to rituals in antiquity involving orbs and sceptres (on the aristocratic and clerical side), and to ancient military training exercises (on
7134-538: The Olympic Games , World Cup , FIH Pro League , Junior World Cup and in past also World League , Champions Trophy . Many countries run extensive junior, senior, and masters club competitions. The FIH is also responsible for organizing the Hockey Rules Board and developing the sport's rules . The sport is known simply as hockey in countries where it is the more common form of hockey. The term field hockey
7257-486: The Rules of Hockey . The pitch is a 91.4 m × 55 m (100.0 yd × 60.1 yd) rectangular field. At each end is a goal 2.14 m (7 ft) high and 3.66 m (12 ft) wide, as well as lines across the field 22.90 m (25 yd) from each end-line (generally referred to as the 23-metre lines or the 25-yard lines) and in the center of the field. A spot 0.15 m (6 in) in diameter, called
7380-406: The goal . The match is won by the team that scores the most goals. Matches are played on grass, watered turf, artificial turf , or indoor boarded surface. The stick is made of wood, carbon fibre , fibreglass and carbon, or a combination of carbon fibre and fibreglass in different quantities. The stick has two sides; one rounded and one flat; only the flat face of the stick is allowed to progress
7503-638: The 2013 season. In the 2011 season, the national women’s team featured in the MJHL as invitation team because there was lack of women’s domestic competitions. It was known as MWHA-SSBP in the MJHL that year. Matri, a team from Perlis refused to play against the MWHA-SSBP team on religious grounds and that resulted in Matri being thrown out of the league, fined RM500 and banned for a year. A team shall consist of maximum of 18 (eighteen) players to be registered with MHF. Out of
SECTION 60
#17330851095467626-556: The 2018 Commonwealth Games, held on the Gold Coast in Brisbane , the hockey games for both men and women were played in four 15-minute quarters. In December 2018, the FIH announced rule changes that would make 15-minute quarters universal from January 2019. England Hockey confirmed that while no changes would be made to the domestic game mid-season, the new rules would be implemented at the start of
7749-663: The 2019–20 season. However, in July 2019 England Hockey announced that 17.5-minute quarters would only be implemented in elite domestic club games. The game begins with a pass back from the centre-forward usually to the centre-half back from the halfway line. The opposing team cannot try to tackle this play until the ball has been pushed back. The team consists of eleven players, usually aligned as follows: goalkeeper, right fullback, left fullback, three half-backs and five forwards who are right wing, right inner, centre forward, left inner and left wing. These positions can change and adapt throughout
7872-691: The East Coast, specifically the Mid-Atlantic in states such as New Jersey, New York, Pennsylvania, Maryland, and Virginia. In recent years, it has become increasingly played on the West Coast and in the Midwest. In other countries, participation is fairly evenly balanced between men and women. For example, in the 2008–09 season, England Hockey reported 2,488 registered men's teams, 1,969 women's teams, 1,042 boys' teams, 966 girls' teams and 274 mixed teams. In 2006,
7995-539: The European Union and Germany have classified synthetic glass fibers as possibly or probably carcinogenic, but fibers can be exempt from this classification if they pass specific tests. A 2012 health hazard review for the European Commission stated that inhalation of fiberglass at concentrations of 3, 16 and 30 mg/m3 "did not induce fibrosis nor tumours except transient lung inflammation that disappeared after
8118-470: The International Federation of Women's Hockey Association (IFWHA) in 1927, though this did not include many continental European countries where women played as sections of men's associations and were affiliated to the FIH. The IFWHA held conferences every three years, and tournaments associated with these were the primary IFWHA competitions. These tournaments were non-competitive until 1975. By
8241-644: The Netherlands, and Germany have dominated at the Olympics and World Cup stages. Women's field hockey was first played at British universities and schools. The first club, the Molesey Ladies, was founded in 1887. The first national association was the Irish Ladies Hockey Union in 1894, and though rebuffed by the Hockey Association, women's field hockey grew rapidly around the world. This led to
8364-515: The Olympic games from 1980 where, as in the men's game, the Netherlands, Germany, and Australia have been consistently strong. Argentina has emerged as a team to be reckoned with since 2000, winning the world championship in 2002 and 2010 and medals at the last three Olympics. In the United States, field hockey is played predominantly by girls and women. There are few field hockey clubs, most play taking place between high school or college sides. The sport
8487-553: The US National Toxicology Program (NTP) removed from its Report on Carcinogens all biosoluble glass wool used in home and building insulation and for non-insulation products. However, NTP still considers fibrous glass dust to be "reasonably anticipated [as] a human carcinogen (Certain Glass Wool Fibers (Inhalable))". Similarly, California's Office of Environmental Health Hazard Assessment (OEHHA) published
8610-463: The United States where hockey more often refers to ice hockey . In Sweden, the term landhockey is used, and to some degree in Norway , where the game is governed by Norges Bandyforbund . The first known club was formed in 1849 at Blackheath in south-east London , but the modern rules grew out of a version played by Middlesex cricket clubs as a winter activity. Teddington Hockey Club formed
8733-467: The above 18, maximum of 3 players can be of foreign origin. At any given point of time minimum 2 players of foreign origin shall be within the field of play during the course of a game. All 18 players in a team have to be registered with the MHF and need to submit their identity cards before the start of the league qualifying for playing in a team. All Malaysian players currently employed have to be taken on lien for
8856-458: The air near manufacturing facilities or when they are near building fires or implosions . The American Lung Association advises that fiberglass insulation should never be left exposed in an occupied area. Since work practices are not always followed, and fiberglass is often left exposed in basements that later become occupied, people can get exposed. No readily usable biological or clinical indices of exposure exist. Fiberglass will irritate
8979-599: The automotive and sport equipment sectors. In the production of some products, such as aircraft, carbon fiber is now used instead of fiberglass, which is stronger by volume and weight. Advanced manufacturing techniques such as pre-pregs and fiber rovings extend fiberglass's applications and the tensile strength possible with fiber-reinforced plastics. Fiberglass is also used in the telecommunications industry for shrouding antennas , due to its RF permeability and low signal attenuation properties. It may also be used to conceal other equipment where no signal permeability
9102-403: The ball accidentally (e.g. it gets stuck in their protective equipment), a penalty corner is awarded. * The action above is permitted only as part of a goal saving action or to move the ball away from the possibility of a goal scoring action by opponents. It does not permit a goalkeeper or player with goalkeeping privileges to propel the ball forcefully with arms, hands or body so that it travels
9225-478: The ball and to use their stick, feet, kickers, leg guards or any other part of their body to stop the ball or deflect it in any direction including over the back line. Similarly, field players are permitted to use their stick. They are not allowed to use their feet and legs to propel the ball, stop the ball or deflect it in any direction including over the back line. However, neither goalkeepers, or players with goalkeeping privileges are permitted to conduct themselves in
9348-402: The ball may not be struck 'hard' with a forehand edge stroke, because of the difficulty of controlling the height and direction of the ball from that stroke. The flat side is always on the "natural" side for a right-handed person swinging the stick at the ball from right to left. Left-handed sticks are rare, as International Hockey Federation rules forbid their use in a game. To make a strike at
9471-433: The ball to be transferred more quickly than on sand-based surfaces. It is this characteristic that has made them the surface of choice for international and national league competitions. Water-based surfaces are also less abrasive than sand-based surfaces and reduce the level of injury to players when they come into contact with the surface. Following the 2018 FIH Congress it was decided that new surfaces being laid should be of
9594-431: The ball with a left-to-right swing the player must present the flat of the 'face' of the stick to the ball by 'reversing' the stick head, i.e. by turning the handle through approximately 180° (while a reverse edge hit would turn the stick head through approximately 90° from the position of an upright forehand stroke with the 'face' of the stick head). Edge hitting of the ball underwent a two-year "experimental period", twice
9717-406: The ball. During play, goalkeepers are the only players allowed to touch the ball with any part of their body. A player's hand is considered part of the stick if holding the stick. If the ball is "played" with the rounded part of the stick (i.e., deliberately stopped or hit), it will result in a penalty (accidental touches are not an offence if they do not materially affect play). Goalkeepers often have
9840-492: The circle everyone including the person taking the penalty must be five meters from the circle and everyone apart from the person taking the free hit must be five meters away from the ball. When taking an attacking free hit, the ball may not be hit straight into the circle if the hitting player is within their attacking 23-meter area (25-yard area). It has to travel 5 meters before going in. Fibreglass Fiberglass ( American English ) or fibreglass ( Commonwealth English )
9963-550: The complexity and tolerances of the mold used for manufacturing the shell. The mechanical functionality of materials is heavily reliant on the combined performances of both the resin (AKA matrix) and fibers. For example, in severe temperature conditions (over 180 °C), the resin component of the composite may lose its functionality, partially due to bond deterioration of resin and fiber. However, GFRPs can still show significant residual strength after experiencing high temperatures (200 °C). One notable feature of fiberglass
10086-412: The construction of composite housing, and can include insulation to reduce heat loss. In rod pumping applications, fiberglass rods are often used for their high tensile strength to weight ratio. Fiberglass rods provide an advantage over steel rods because they stretch more elastically (lower Young's modulus ) than steel for a given weight, meaning more oil can be lifted from the hydrocarbon reservoir to
10209-440: The course of the game depending on the attacking and defensive style of the opposition. When hockey positions are discussed, notions of fluidity are very common. Each team can be fielded with a maximum of 11 players and will typically arrange themselves into forwards, midfielders, and defensive players (fullbacks) with players frequently moving between these lines with the flow of play. Each team may also play with: As hockey has
10332-973: The design, a certain amount of internal stress is created; and if it becomes too great, cracks form. The most common types of glass fiber used in fiberglass is E-glass , which is alumino-borosilicate glass with less than 1% w/w alkali oxides, mainly used for glass-reinforced plastics. Other types of glass used are A-glass ( A lkali-lime glass with little or no boron oxide), E-CR-glass ( E lectrical/ C hemical R esistance; alumino-lime silicate with less than 1% w/w alkali oxides, with high acid resistance), C-glass (alkali-lime glass with high boron oxide content, used for glass staple fibers and insulation), D-glass (borosilicate glass, named for its low D ielectric constant), R-glass (alumino silicate glass without MgO and CaO with high mechanical requirements as R einforcement), and S-glass (alumino silicate glass without CaO but with high MgO content with high tensile strength). Pure silica (silicon dioxide), when cooled as fused quartz into
10455-581: The duration of the league and then be registered with MHF. All the foreign players must obtain International Transfer Certificates from their respective countries and or clubs before signing up with the team in MHL and MHF. There are a number of players from countries other than Malaysia, who have been contracted to play in the league. The league champion is crowned by finishing top of the league table of two round robin matches. The overall cup
10578-433: The early 1940s, and many sailing vessels made after 1950 were built using the fiberglass lay-up process . As of 2022, boats continue to be made with fiberglass, though more advanced techniques such as vacuum bag moulding are used in the construction process. Though most bullet-resistant armours are made using different textiles, fiberglass composites have been shown to be effective as ballistic armor. Filament winding
10701-447: The early 1970s, artificial turf began to be used. Synthetic pitches changed most aspects of field hockey, gaining speed. New tactics and techniques such as the Indian dribble developed, followed by new rules to take account. The switch to synthetic surfaces ended Indian and Pakistani domination because artificial turf was too expensive in developing countries . Since the 1970s, Australia,
10824-456: The early 1970s, there were 22 associations with women's sections in the FIH and 36 associations in the IFWHA. Discussions started about a common rule book. The FIH introduced competitive tournaments in 1974, forcing the acceptance of the principle of competitive field hockey by the IFWHA in 1973. It took until 1982 for the two bodies to merge, but this allowed the introduction of women's field hockey to
10947-562: The eyes, skin, and the respiratory system. Hence, symptoms can include itchy eyes, skin, nose, sore throat, hoarseness, dyspnea (breathing difficulty) and cough. Peak alveolar deposition was observed in rodents and humans for fibers with diameters of 1 to 2 μm. In animal experiments, adverse lung effects such as lung inflammation and lung fibrosis have occurred, and increased incidences of mesothelioma , pleural sarcoma , and lung carcinoma had been found with intrapleural or intratracheal instillations in rats. As of 2001, in humans only
11070-563: The fiber has an effect on the properties of the final product. A high angle "hoop" will provide circumferential or "burst" strength, while lower angle patterns (polar or helical) will provide greater longitudinal tensile strength. Products currently being produced using this technique range from pipes, golf clubs, Reverse Osmosis Membrane Housings, oars, bicycle forks, bicycle rims, power and transmission poles, pressure vessels to missile casings, aircraft fuselages and lamp posts and yacht masts. A release agent, usually in either wax or liquid form,
11193-434: The fiber is weak in compression, it is actually only the long aspect ratio of the fiber which makes it seem so; i.e., because a typical fiber is long and narrow, it buckles easily. On the other hand, the glass fiber is weak in shear—that is, across its axis. Therefore, if a collection of fibers can be arranged permanently in a preferred direction within a material, and if they can be prevented from buckling in compression,
11316-415: The fiberglass and the mold. Additional resin is applied and possibly additional sheets of fiberglass. Hand pressure, vacuum or rollers are used to be sure the resin saturates and fully wets all layers, and that any air pockets are removed. The work must be done quickly before the resin starts to cure unless high-temperature resins are used which will not cure until the part is warmed in an oven. In some cases,
11439-420: The final structure to be strong, the fiber's surfaces must be almost entirely free of defects, as this permits the fibers to reach gigapascal tensile strengths . If a bulk piece of glass were defect-free, it would be as strong as glass fibers; however, it is generally impractical to produce and maintain bulk material in a defect-free state outside of laboratory conditions. The process of manufacturing fiberglass
11562-428: The free hit is taken. As mentioned above, a 15 m hit is awarded if an attacking player commits a foul forward of that line, or if the ball passes over the back line off an attacker. These free hits are taken in-line with where the foul was committed (taking a line parallel with the sideline between where the offence was committed, or the ball went out of play). When an attacking free hit is awarded within 5 m of
11685-459: The gas content of the material was replaced by plastic. This reduced the insulation properties to values typical of the plastic, but now for the first time, the composite showed great strength and promise as a structural and building material. Many glass fiber composites continued to be called "fiberglass" (as a generic name) and the name was also used for the low-density glass wool product containing gas instead of plastic. Ray Greene of Owens Corning
11808-473: The glass into short lengths and drops it into a jet of resin, projected onto the surface of a mold), or in an intermediary step, to manufacture fabrics such as chopped strand mat (CSM) (made of randomly oriented small cut lengths of fiber all bonded together), woven fabrics, knit fabrics or unidirectional fabrics. Chopped strand mat (CSM) is a form of reinforcement used in fiberglass. It consists of glass fibers laid randomly across each other and held together by
11931-441: The legal limit ( permissible exposure limit ) for fiberglass exposure in the workplace as 15 mg/m total and 5 mg/m in respiratory exposure over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 3 fibers/cm (less than 3.5 micrometers in diameter and greater than 10 micrometers in length) as a time-weighted average over an 8-hour workday, and
12054-413: The mandrel is completely covered to the desired thickness, the resin is cured; often the mandrel is placed in an oven to achieve this, though sometimes radiant heaters are used with the mandrel still turning in the machine. Once the resin has cured, the mandrel is removed, leaving the hollow final product. For some products such as gas bottles, the 'mandrel' is a permanent part of the finished product forming
12177-449: The material will be preferentially strong in that direction. Furthermore, by laying multiple layers of fiber on top of one another, with each layer oriented in various preferred directions, the material's overall stiffness and strength can be efficiently controlled. In fiberglass, it is the plastic matrix which permanently constrains the structural glass fibers to directions chosen by the designer. With chopped strand mat, this directionality
12300-494: The midfield and strikers being responsible for re-adjusting to fill the space they left. Movement between lines like this is particularly common across all positions. This fluid Australian culture of hockey has been responsible for developing an international trend towards players occupying spaces on the field, not having assigned positions. Although they may have particular spaces on the field which they are more comfortable and effective as players, they are responsible for occupying
12423-556: The modern game by introducing the striking circle and changing the ball to a sphere from a rubber cube. The Hockey Association was founded in 1876. It lasted just six years, before being revived by nine founding members. The first international competition took place in 1895 (Ireland 3, Wales 0), and the International Rules Board was founded in 1900. Field hockey was played at the Summer Olympics in 1908 and 1920. It
12546-586: The more biopersistent materials like ceramic fibres, which are used industrially as insulation in high-temperature environments such as blast furnaces , and certain special-purpose glass wools not used as insulating materials remain classified as possible carcinogens ( IARC Group 2B ). The more commonly used glass fibre wools including insulation glass wool , rock wool and slag wool are considered not classifiable as to carcinogenicity to humans ( IARC Group 3 ). In October 2001, all fiberglass wools commonly used for thermal and acoustical insulation were reclassified by
12669-418: The opposing team's goal. There are no set plays unless your team has them. Free hits are awarded when offences are committed outside the scoring circles (the term 'free hit' is standard usage but the ball need not be hit). The ball may be hit, pushed or lifted in any direction by the team offended against. The ball can be lifted from a free hit but not by hitting, the ball must be flicked or scooped to lift from
12792-432: The other team. Penalty for this is the opposing team receives the ball and if the problem continues, the player can be carded. While a player is taking a free hit or starting a corner the back swing of their hit cannot be too high for this is considered dangerous. Finally there may not be three players touching the ball at one time. Two players from opposing teams can battle for the ball, however if another player interferes it
12915-483: The participation of 14 teams from nine states, with exception of teams from Perlis, Malacca and Sarawak. SSTMI-Thunderbolt lifted the inaugural Women’s Junior Hockey League title with a slim 2-1 win over Kuala Lumpur Wipers in the final. The league is specifically for boys’ Under-19 league, however few women's team has expressed interest to join the junior league. This includes Tunku Mahkota Ismail Sports School (SSTMI) girls’ team that have submitted their entry to play in
13038-546: The penalty spot or stroke mark, is placed with its centre 6.40 m (7 yd) from the centre of each goal. The shooting circle is 15 m (16 yd) from the base line. Field hockey goals are made of two upright posts, joined at the top by a horizontal crossbar, with a net positioned to catch the ball when it passes through the goalposts. The goalposts and crossbar must be white and rectangular in shape, and should be 2 in (51 mm) wide and 2–3 in (51–76 mm) deep. Field hockey goals also include sideboards and
13161-405: The pitch at any one time. The remaining players may be substituted in any combination. There is an unlimited number of times a team can sub in and out. Substitutions are permitted at any point in the game, apart from between the award and end of a penalty corner; two exceptions to this rule is for injury or suspension of the defending goalkeeper, which is not allowed when playing with a field keep, or
13284-604: The popular side); polo (essentially hockey on horseback) was devised by the Ancient Persians for cavalry training, based on the local proto-hockey foot game of the region. The word hockey itself has no clear origin. One belief is that it was recorded in 1363 when Edward III of England issued the proclamation: "Moreover we ordain that you prohibit under penalty of imprisonment all and sundry from such stone, wood and iron throwing; handball, football, or hockey; coursing and cock-fighting, or other such idle games". The belief
13407-421: The proclamation in 1720, and the word hockey remains of unknown origin. The modern game developed at public schools in 19th century England. It is now played globally, particularly in parts of Western Europe, South Asia, Southern Africa, Australia, New Zealand, Argentina, and parts of the United States, primarily New England and the mid-Atlantic states. The term field hockey is used primarily in Canada and
13530-422: The sideline is still in), it is returned to play with a sideline hit, taken by a member of the team whose players were not the last to touch the ball before crossing the sideline. The ball must be placed on the sideline, with the hit taken from as near the place the ball went out of play as possible. If it crosses the back line after last touched by an attacker, a 15 m (16 yd) hit is awarded. A 15 m hit
13653-424: The space nearest them. This fluid approach to hockey and player movement has made it easy for teams to transition between formations such as: "3 at the back" , "5 midfields" , "2 at the front" , and more. When the ball is inside the circle, they are defending and they have their stick in their hand, goalkeepers wearing full protective equipment are permitted to use their stick, feet, kickers or leg guards to propel
13776-439: The stick. If the back side of the stick is used, it is a penalty and the other team will get the ball back. Tackling is permitted as long as the tackler does not make contact with the attacker or the other person's stick before playing the ball (contact after the tackle may also be penalised if the tackle was made from a position where contact was inevitable). Further, the player with the ball may not deliberately use his body to push
13899-628: The surface with each stroke, all while reducing the load on the pumping unit. Fiberglass rods must be kept in tension, however, as they frequently part if placed in even a small amount of compression. The buoyancy of the rods within a fluid amplifies this tendency. GRP and GRE pipe can be used in a variety of above- and below-ground systems, including those for desalination, water treatment, water distribution networks, chemical process plants, water used for firefighting, hot and cold drinking water, wastewater/sewage, municipal waste and liquified petroleum gas . Fiberglass composite boats have been made since
14022-478: The usual length of an "experimental trial" and is still a matter of some controversy within the game. Ric Charlesworth, the former Australian coach, has been a strong critic of the unrestricted use of the reverse edge hit. The 'hard' forehand edge hit was banned after similar concerns were expressed about the ability of players to direct the ball accurately, but the reverse edge hit does appear to be more predictable and controllable than its counterpart. This type of hit
14145-482: The work is covered with plastic sheets and vacuum is drawn on the work to remove air bubbles and press the fiberglass to the shape of the mold. The fiberglass spray lay-up process is similar to the hand lay-up process but differs in the application of the fiber and resin to the mold. Spray-up is an open-molding composites fabrication process where resin and reinforcements are sprayed onto a mold. The resin and glass may be applied separately or simultaneously "chopped" in
14268-415: The workplace during its fabrication, installation or removal, by breathing it in, by skin contact, or by eye contact. Furthermore, in the manufacturing process of fiberglass, styrene vapors are released while the resins are cured. These are also irritating to mucous membranes and respiratory tract. The general population can get exposed to fibreglass from insulation and building materials or from fibers in
14391-490: Was accidentally discovered in 1932 when Games Slayter , a researcher at Owens-Illinois , directed a jet of compressed air at a stream of molten glass and produced fibers. A patent for this method of producing glass wool was first applied for in 1933. Owens joined with the Corning company in 1935 and the method was adapted by Owens Corning to produce its patented "Fiberglas" (spelled with one "s") in 1936. Originally, Fiberglas
14514-425: Was a glass wool with fibers entrapping a great deal of gas, making it useful as an insulator, especially at high temperatures. A suitable resin for combining the fiberglass with a plastic to produce a composite material was developed in 1936 by DuPont . The first ancestor of modern polyester resins is Cyanamid 's resin of 1942. Peroxide curing systems were used by then. With the combination of fiberglass and resin
14637-637: Was dropped in 1924, leading to the foundation of the Fédération Internationale de Hockey sur Gazon (FIH) as an international governing body by seven continental European nations; and hockey was reinstated as an Olympic game in 1928. Men's hockey united under the FIH in 1970. The two oldest trophies are the Irish Senior Cup , which dates back to 1894, and the Irish Junior Cup , a second XI-only competition instituted in 1895. In India,
14760-496: Was first played in 2000 involving 11 teams. Initiated by Malaysian Hockey Federation (MHF) with active support from sports channel ESPN Malaysia. First season had two tiers division 1 and division 2 but from 2007 season onwards division 2 was scrapped. Except team winning 2006 division 2 championship rest all teams in division 2 were scrapped. The inaugural women’s junior league, also an Under-19 event took off in 2016 season. It runs from February 19 to April 10. The league attracted
14883-411: Was largely introduced in the U.S. by Constance Applebee , starting with a tour of Seven Sisters colleges in 1901 and continuing through Applebee's 24-year tenure as athletic director of Bryn Mawr College . The strength of college field hockey reflects the impact of Title IX , which mandated that colleges should fund men's and women's games programmes comparably. Hockey has been predominantly played on
15006-615: Was played in the 17th century in Punjab state in India under name khido khundi ( khido refers to the woolen ball, and khundi to the stick). In South America, most specifically in Chile , the local natives of the 16th century used to play a game called chueca , which also shares common elements with hockey. In Northern Europe , the games of hurling ( Ireland ) and knattleikr ( Iceland ), both team ball games involving sticks to drive
15129-443: Was the first type of glass used for fiberglass. E-glass ("E" because of initial Electrical application), is alkali-free and was the first glass formulation used for continuous filament formation. It now makes up most of the fiberglass production in the world, and also is the single largest consumer of boron minerals globally. It is susceptible to chloride ion attack and is a poor choice for marine applications. S-glass ("S" for "stiff")
#545454