The Benin River is a river that flows through the south west of Nigeria .
83-566: The river starts under the name " Ethiope " in the south east of the state, Edo . Subsequently, it runs through various cities and villages, such as Umutu , Owah Abbi , Obiaruku , Abraka , Igun Watershed , Idjerhe Kingdom , Sapele , Mosogar and Koko . Near Sapele the Ethiope continues into the Benin. From here on the river widens into a small estuary and discharges into the Gulf of Guinea . The Benin
166-447: A fiber, sometimes called 'elastic', had significant value to the textile industry because of its excellent elongation and recovery properties. For these purposes, manufactured rubber fiber was made as either an extruded round fiber or rectangular fibers cut into strips from extruded film. Because of its low dye acceptance, feel and appearance, the rubber fiber was either covered by yarn of another fiber or directly woven with other yarns into
249-510: A form of assisted biological coagulation. Little care is taken to exclude twigs, leaves, and even bark from the lumps that are formed, which may also include tree lace. Earth scrap is material that gathers around the base of the tree. It arises from latex overflowing from the cut and running down the bark, from rain flooding a collection cup containing latex, and from spillage from tappers' buckets during collection. It contains soil and other contaminants, and has variable rubber content, depending on
332-752: A given strain, thereby increasing the elastic force constant and making the rubber harder and less extensible. Raw rubber storage depots and rubber processing can produce malodour that is serious enough to become a source of complaints and protest to those living in the vicinity. Microbial impurities originate during the processing of block rubber. These impurities break down during storage or thermal degradation and produce volatile organic compounds. Examination of these compounds using gas chromatography / mass spectrometry (GC/MS) and gas chromatography (GC) indicates that they contain sulfur, ammonia, alkenes , ketones , esters , hydrogen sulfide , nitrogen, and low-molecular-weight fatty acids (C2–C5). When latex concentrate
415-432: A petroleum refinery or other natural incineration processes, is sometimes used as an additive to rubber to improve its strength, especially in vehicle tires. During vulcanization, rubber's polyisoprene molecules (long chains of isoprene) are heated and cross-linked with molecular bonds to sulfur, forming a 3-D matrix. The optimal percentage of sulfur is approximately 10%. In this form, the polyisoprene molecules orientation
498-506: A piece of the material was extremely good for rubbing off pencil marks on paper, hence the name "rubber". It slowly made its way around England. In 1764, François Fresnau discovered that turpentine was a rubber solvent . Giovanni Fabbroni is credited with the discovery of naphtha as a rubber solvent in 1779. Charles Goodyear redeveloped vulcanization in 1839, although Mesoamericans had used stabilized rubber for balls and other objects as early as 1600 BC. South America remained
581-570: A plurality of votes in the highest number of local government Areas. English is the official language of the state. The major tribal languages spoken in the state are Edo , Etuno , Etsako , Esan , Ake-Ievbu and Okpamheri . Edo State is home to several ethnicities, they are the Edo , Okpe , Esan , Afenmai , Akoko , Igbanke , Emai . The Etsako/Afemai people of Edo state have the highest population of Muslims. They live in Six local government areas within
664-435: A point where it shares properties of both; i.e., if it is heated and cooled, it is degraded but not destroyed. The final properties of a rubber item depend not just on the polymer, but also on modifiers and fillers, such as carbon black , factice , whiting and others. Rubber particles are formed in the cytoplasm of specialized latex-producing cells called laticifers within rubber plants. Rubber particles are surrounded by
747-647: A river in Nigeria is a stub . You can help Misplaced Pages by expanding it . Edo State Edo , officially known as Edo State , is a state in the South-South geopolitical zone of the federal republic of Nigeria . As of 2022, the state was ranked as the 22nd most populous state (4,777,000) in Nigeria. The estimated state population is around 4,777,000 in 2022. Edo State is the 22nd largest State by landmass in Nigeria. The state's capital and largest city, Benin City ,
830-451: A significant amount of rubber. Gloves (medical, household, and industrial) and toy balloons were large consumers of rubber, although the type of rubber used is concentrated latex. Significant tonnage of rubber was used as adhesives in many manufacturing industries and products, although the two most noticeable were the paper and the carpet industries. Rubber was commonly used to make rubber bands and pencil erasers . Rubber produced as
913-453: A single phospholipid membrane with hydrophobic tails pointed inward. The membrane allows biosynthetic proteins to be sequestered at the surface of the growing rubber particle, which allows new monomeric units to be added from outside the biomembrane, but within the lacticifer. The rubber particle is an enzymatically active entity that contains three layers of material, the rubber particle, a biomembrane and free monomeric units. The biomembrane
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#1732851525224996-401: A wire that encircles the tree. This wire incorporates a spring so it can stretch as the tree grows. The latex is led into the cup by a galvanised "spout" knocked into the bark. Rubber tapping normally takes place early in the morning, when the internal pressure of the tree is highest. A good tapper can tap a tree every 20 seconds on a standard half-spiral system, and a common daily "task" size
1079-474: Is -0.68% lower than Nigeria's averages. Edo typically receives about 183.49 millimeters (7.22 inches) of precipitation and has 265.91 rainy days (72.85% of the time) annually and at an elevation of 239.16 meters (784.65 feet) above sea level. With Benin City as capital, the population of the entire state is approximately 5 million. It is made up of four major ethnic groups ; namely Edo (Binis), Owan , Esan and Afemai ( Etsako & Akoko Edo ). However,
1162-442: Is 25 cm (vertical) bark consumption per year. The latex-containing tubes in the bark ascend in a spiral to the right. For this reason, tapping cuts usually ascend to the left to cut more tubes. The trees drip latex for about four hours, stopping as latex coagulates naturally on the tapping cut, thus blocking the latex tubes in the bark. Tappers usually rest and have a meal after finishing their tapping work and then start collecting
1245-699: Is a collaboration of Federal Ministry of Transportation, Nigerian Ports Authority and Edo state government and the transaction adviser CPCS Transcom of Canada. The Port of Antwerp International has also collaborated with Edo state government to make the project easy and fast to complete and in other ways to see the Benin Port become both a cargo handling port and an industrial complex to enhance industrial production and promotion in Edo state. 5°49′54.7″N 5°9′11.3″E / 5.831861°N 5.153139°E / 5.831861; 5.153139 This article related to
1328-418: Is a natural polymer of isoprene (polyisoprene), and an elastomer (a stretchy polymer). Polymers are simply chains of molecules that can be linked together. Rubber is one of the few naturally occurring polymers and prized for its high stretch ratio, resilience, and water-proof properties. Other examples of natural polymers include tortoise shell , amber , and animal horn . When harvested, latex rubber takes
1411-415: Is between 450 and 650 trees. Trees are usually tapped on alternate or third days, although many variations in timing, length and number of cuts are used. "Tappers would make a slash in the bark with a small hatchet. These slanting cuts allowed latex to flow from ducts located on the exterior or the inner layer of bark ( cambium ) of the tree. Since the cambium controls the growth of the tree, growth stops if it
1494-491: Is cut. Thus, rubber tapping demanded accuracy, so that the incisions would not be too many given the size of the tree, or too deep, which could stunt its growth or kill it." It is usual to tap a panel at least twice, sometimes three times, during the tree's life. The economic life of the tree depends on how well the tapping is carried out, as the critical factor is bark consumption. A standard in Malaysia for alternate daily tapping
1577-552: Is harvested mainly in the form of the latex from the Pará rubber tree ( Hevea brasiliensis ) or others. The latex is a sticky, milky and white colloid drawn off by making incisions in the bark and collecting the fluid in vessels in a process called "tapping". The latex then is refined into the rubber that is ready for commercial processing. In major areas, latex is allowed to coagulate in the collection cup. The coagulated lumps are collected and processed into dry forms for sale. Natural rubber
1660-438: Is held tightly to the rubber core by the high negative charge along the double bonds of the rubber polymer backbone. Free monomeric units and conjugated proteins make up the outer layer. The rubber precursor is isopentenyl pyrophosphate (an allylic compound), which elongates by Mg -dependent condensation by the action of rubber transferase. The monomer adds to the pyrophosphate end of the growing polymer. The process displaces
1743-556: Is low and strain results from small changes of bond lengths and angles: this caused the Challenger disaster , when the American Space Shuttle 's flattened o-rings failed to relax to fill a widening gap. The glass transition is fast and reversible: the force resumes on heating. The parallel chains of stretched rubber are susceptible to crystallization. This takes some time because turns of twisted chains have to move out of
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#17328515252241826-892: Is not cultivated widely in its native continent of South America because of the South American leaf blight , and other natural predators there. Rubber latex is extracted from rubber trees. The economic life of rubber trees in plantations is around 32 years, with up to 7 years being an immature phase and about 25 years of productive phase. The soil requirement is well-drained, weathered soil consisting of laterite , lateritic types, sedimentary types, nonlateritic red or alluvial soils. The climatic conditions for optimum growth of rubber trees are: Many high-yielding clones have been developed for commercial planting. These clones yield more than 2,000 kilograms per hectare (1,800 lb/acre) of dry rubber per year, under ideal conditions. Rubber production has been linked to deforestation. Rubber therefore
1909-582: Is one of seven commodities included in the 2023 EU Regulation on Deforestation-free products (EUDR), which aims to guarantee that the products European Union (EU) citizens consume do not contribute to deforestation or forest degradation worldwide. In places such as Kerala and Sri Lanka, where coconuts are in abundance, the half shell of coconut was used as the latex collection container. Glazed pottery or aluminium or plastic cups became more common in Kerala-India and other countries. The cups are supported by
1992-484: Is organized on the basis of age-grades similar to those of the villages as well as on the basis of wards and chiefs, both hereditary and non-hereditary, serving the Oba in specialised functions. The Oba is the focal point of the Benin political system and institution is based squarely on that of divine kingship. Edo state has a Tropical wet and dry or savanna climate with yearly temperature of 28.78 °C (83.8 °F) and it
2075-461: Is partly a branch of the Niger , as the two rivers are connected through a few streams . The river is also the hub of various commercial activities including a collection point for palm oil and kernels and timber. Another activity around the river and its port include fishing, which includes the harvesting of crayfish and shrimps. The river is also used for transportation since it is wide and deep, while
2158-449: Is produced by smallholders, who collect rubber from trees far from the nearest factory. Many Indonesian smallholders, who farm paddies in remote areas, tap dispersed trees on their way to work in the paddy fields and collect the latex (or the coagulated latex) on their way home. As it is often impossible to preserve the latex sufficiently to get it to a factory that processes latex in time for it to be used to make high quality products, and as
2241-529: Is produced from rubber, sulfuric acid is used for coagulation. This produces malodourous hydrogen sulfide. The industry can mitigate these bad odours with scrubber systems . Rubber is the polymer cis-1,4-polyisoprene – with a molecular weight of 100,000 to 1,000,000 daltons . Typically, a small percentage (up to 5% of dry mass) of other materials, such as proteins , fatty acids , resins , and inorganic materials (salts) are found in natural rubber. Polyisoprene can also be created synthetically, producing what
2324-593: Is served by Benin Airport with flights to Abuja, Kano, Lagos and Port Harcourt. Rubber Rubber , also called India rubber , latex , Amazonian rubber , caucho , or caoutchouc , as initially produced, consists of polymers of the organic compound isoprene , with minor impurities of other organic compounds. Thailand , Malaysia , Indonesia , and Cambodia are four of the leading rubber producers. Types of polyisoprene that are used as natural rubbers are classified as elastomers . Currently, rubber
2407-402: Is sometimes referred to as "synthetic natural rubber", but the synthetic and natural routes are distinct. Some natural rubber sources, such as gutta-percha , are composed of trans-1,4-polyisoprene, a structural isomer that has similar properties. Natural rubber is an elastomer and a thermoplastic . Once the rubber is vulcanized, it is a thermoset . Most rubber in everyday use is vulcanized to
2490-472: Is still random but they become aligned when the rubber is stretched. This sulfur vulcanization makes the rubber stronger and more rigid, but still very elastic. And through the vulcanization process, the sulfur and latex are meant to be totally used up in individual form. Natural rubber latex is shipped from factories in Southeast Asia , South America , and West and Central Africa to destinations around
2573-601: Is the Edo language , which is commonly spoken in Benin City. Christianity is the dominant religion in Edo State. It was first introduced to the region by Portuguese missionaries during the 15th century. Islam and traditional religions are also practised. The Mid-Western Region was a division of Nigeria from 1963 to 1991, formally known as Bendel state from 1976. It was formed in June 1963 from Benin and Delta provinces of
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2656-453: Is the fourth largest city in Nigeria, and the centre of the country's rubber industry. Created in 1991 from the former Bendel State , it is also known as the heart beat of the nation. Edo State borders Kogi State to the north for 133 km and across the Niger River for 81 km to the northeast, Anambra State to the east for about four km across the Niger River, Delta State to
2739-462: Is the Amazonian rubber tree ( Hevea brasiliensis ), a member of the spurge family , Euphorbiaceae . Once native to Brazil, the species is now pan-tropical. This species is preferred because it grows well under cultivation. A properly managed tree responds to wounding by producing more latex for several years. Congo rubber , formerly a major source of rubber, which motivated the atrocities in
2822-454: Is the legislative body. The electoral system of each state is selected using a modified two-round system. To be elected in the first round, a candidate must receive the plurality of the vote and over 25% of the vote in at least two -third of the State local government Areas. If no candidate passes threshold, a second round will be held between the top candidate and the next candidate to have received
2905-474: Is used extensively in many applications and products, either alone or in combination with other materials. In most of its useful forms, it has a large stretch ratio and high resilience and also is buoyant and water-proof. Industrial demand for rubber-like materials began to outstrip natural rubber supplies by the end of the 19th century, leading to the synthesis of synthetic rubber in 1909 by chemical means. The major commercial source of natural rubber latex
2988-602: The British Empire conducted a punitive expedition of the region, destroying most of the ancient city of Edo and incorporating the territory into what would become the Southern Nigeria Protectorate . Edo State is a diverse state that is predominantly inhabited by the Edoid people , including the Edo (or Bini) , Esan , Ora, Akoko-Edo, Owan and Afemai people among others. The most common Edoid language spoken
3071-552: The Church of Nigeria under Archbishop Cyril Odutemu (2020) includes the Diocese of Akoko-Edo (2007) led by Bishop Jolly Ehigiator Oyekpen until he died 2022, the Diocese of Benin (1962) led by Bishop Peter Imasuen (2004), the Diocese of Esan (2000) led by Bishop Gabriel Elabor (2020), the Diocese of Etsako (2007) led by Bishop Felix Unuokhe Olorunfemi , the Diocese of Oleh (1999) led by Bishop John Usiwoma Aruakpor (2012), and
3154-677: The Diocese of Sabongidda-Ora (1993) led by Bishop Augustine Ohilebo (2004). Tourist attractions in Edo State include the Emotan Statue in Benin City, Ise Lake and River Niger Beach in Agenebode , Etsako-East; Mike Akhigbe Square at fugar , Ambrose Alli Square, Ekpoma , River Niger Beaches at Ilushi , BFFM Building at Ewu , Obiemen lake in Agua Irrua, Igun Bronze Caster at Igun Street in Benin City, College of Agriculture and Aqua Culture Technology, Agenebode, Okpekpe with its hills and scenes and
3237-583: The Fraunhofer Institute for Molecular Biology and Applied Ecology (IME) in Germany developed a cultivar of the Kazakh dandelion ( Taraxacum kok-saghyz ) that is suitable for commercial production of natural rubber. In collaboration with Continental Tires , IME began a pilot facility. Many other plants produce forms of latex rich in isoprene polymers, though not all produce usable forms of polymer as easily as
3320-496: The Mullins effect and the Payne effect and is often modeled as hyperelastic . Rubber strain crystallizes . Because there are weakened allylic C-H bonds in each repeat unit , natural rubber is susceptible to vulcanisation as well as being sensitive to ozone cracking . The two main solvents for rubber are turpentine and naphtha (petroleum). Because rubber does not dissolve easily,
3403-697: The Putumayo genocide . Between the 1880s–1913 Julio César Arana and his company that would become the Peruvian Amazon Company controlled the Putumayo river. W.E. Hardenburg, Benjamin Saldaña Rocca and Roger Casement were influential figures in exposing these atrocities. Roger Casement was also prominent in revealing the Congo atrocities to the world. Days before entering Iquitos by boat Casement wrote "'Caoutchouc
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3486-557: The cytosol . In plants, isoprene pyrophosphate can also be obtained from the 1-deox-D-xyulose-5-phosphate/2-C-methyl-D-erythritol-4-phosphate pathway within plasmids. The relative ratio of the farnesyl pyrophosphate initiator unit and isoprenyl pyrophosphate elongation monomer determines the rate of new particle synthesis versus elongation of existing particles. Though rubber is known to be produced by only one enzyme, extracts of latex host numerous small molecular weight proteins with unknown function. The proteins possibly serve as cofactors, as
3569-649: The Congo Free State for more information on the rubber trade in the Congo Free State in the late 1800s and early 1900s.) The rubber boom in the Amazon also similarly affected indigenous populations to varying degrees. Correrias, or slave raids were frequent in Colombia, Peru and Bolivia where many were either captured or killed. The most well known case of atrocities generated from rubber extraction in South America came from
3652-534: The Congo Free State , came from vines in the genus Landolphia ( L. kirkii , L. heudelotis , and L. owariensis ). Dandelion milk contains latex. The latex exhibits the same quality as the natural rubber from rubber trees . In the wild types of dandelion, latex content is low and varies greatly. In Nazi Germany , research projects tried to use dandelions as a base for rubber production, but failed. In 2013, by inhibiting one key enzyme and using modern cultivation methods and optimization techniques, scientists in
3735-562: The Pará. Some of them require more elaborate processing to produce anything like usable rubber, and most are more difficult to tap. Some produce other desirable materials, for example gutta-percha ( Palaquium gutta ) and chicle from Manilkara species. Others that have been commercially exploited, or at least showed promise as rubber sources, include the rubber fig ( Ficus elastica ), Panama rubber tree ( Castilla elastica ), various spurges ( Euphorbia spp.), lettuce ( Lactuca species),
3818-519: The State has a high presence of residents from across the country and the world because of its cosmopolitan tendencies. Benin City has a history of being one of the foremost destinations of Europeans during their exploration of Africa continent many centuries ago. Some of these flash points have remained enviable tourists' attraction sites for the state. The people are known for having several Edo traditional food . The main ethnic groups in Edo State are Édo, Etsako, Esan, Owan, and Akoko Edo. Some of
3901-516: The State. The State Judiciary is headed by a Chief Judge. On 19 May 2023, Former Edo State Governor, Godwin Obaseki swore in Hon. Justice Daniel Iyobosa Okungbowa as Acting Chief Judge of Edo State, following the retirement of Justice Joe Acha. Monday Okpebholo is the current governor of Edo State and was sworn into office on 12 November 2024. His deputy is Dennis Idahosa . The Edo State House of Assembly
3984-832: The Usomege Hills at Apana-Uzairue, Somorika hills in Akoko Edo , where a government-run tourist center at Ososo is set among spectacular scenery. The state produces crude oil, and other mineral resources like limestone and quarry. The state has a cement factory at Okpella and a Flour Mill at Ewu which is moribund. The following are the Mineral Resources found in Edo State Notable tertiary learning institutions in Edo state include: List of Edo State Medical zones and associated local government areas. Federal Highways are Other major roads include Airports: Benin City
4067-573: The Western Region, and its capital was Benin City. It was renamed a province in 1966, and in 1967 when the other provinces were split up into several states, it remained territorially intact, becoming a state. During the Nigerian Civil War , the Biafran forces invaded the new Mid-Western state, en route to Lagos , in an attempt to force a quick end to the war. While under Biafran occupation,
4150-453: The adjoining land is used for cultivation of arable and commercial crops. The Benin river has two to three seasons the dry and hot season, from January to April it is very hot and dry, while in May to July and September is raining season. The North part of the river has an extreme temperature, very hot and dry different from the southern side of the river. A recent study conducted by WHO revealed
4233-409: The amount of contaminants. Earth scrap is collected by field workers two or three times a year and may be cleaned in a scrap-washer to recover the rubber, or sold to a contractor who cleans it and recovers the rubber. It is of low quality. Latex coagulates in the cups if kept for long and must be collected before this happens. The collected latex, "field latex", is transferred into coagulation tanks for
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#17328515252244316-528: The borderlands. Also, Ika speaking communities exist in Igbanke (Ika) in Orhionmwon LGA. Edo State consists of eighteen (18) Local Government Areas . They are: Edo State House Of Assembly Division List 2013, consists of twenty-four (24) divisions: The Judiciary is the third arm of Government in the State, vested with the power to interpret the laws and resolve disputes in both civil and criminal matters in
4399-407: The dry rubber produced. Latex that drips onto the ground, "earth scrap", is also collected periodically for processing of low-grade product. Cup lump is the coagulated material found in the collection cup when the tapper next visits the tree to tap it again. It arises from latex clinging to the walls of the cup after the latex was last poured into the bucket, and from late-dripping latex exuded before
4482-636: The fabric. Rubber yarns were used in foundation garments. While rubber is still used in textile manufacturing, its low tenacity limits its use in lightweight garments because latex lacks resistance to oxidizing agents and is damaged by aging, sunlight, oil and perspiration. The textile industry turned to neoprene (polymer of chloroprene ), a type of synthetic rubber, as well as another more commonly used elastomer fiber, spandex (also known as elastane), because of their superiority to rubber in both strength and durability. Rubber exhibits unique physical and chemical properties. Rubber's stress–strain behavior exhibits
4565-477: The first technique for tapping trees for latex without causing serious harm to the tree. Because of his fervent promotion of this crop, he is popularly remembered by the nickname "Mad Ridley". Before World War II significant uses included door and window profiles, hoses, belts, gaskets, matting , flooring, and dampeners (antivibration mounts) for the automotive industry. The use of rubber in car tires (initially solid rather than pneumatic) in particular consumed
4648-544: The form of latex, an opaque, white, milky suspension of rubber particles in water. It is then transformed through industrial processes to the solid form widely seen in manufactured goods. Natural rubber is reactive and vulnerable to oxidization, but it can be stabilized through a heating process called vulcanization. Vulcanization is a process by which the rubber is heated and sulfur , peroxide , or bisphenol are added to improve resistance and elasticity and to prevent it from oxidizing. Carbon black , which can be derived from
4731-708: The groups can trace their origin to Benin City, hence their dialects vary with their distance from Benin City. The Edo speaking people occupy seven out of the 18 Local Government Areas (LGAs) of the state and constitute 57.54% of the total population. Others are as follows: Esan (17.14%), Etsako (12.19%), Owan (7.43%), and Akoko Edo (5.70%). There are also Igbira speaking communities in Akoko Edo, Itsekiri communities in Ikpoba-Okha, and Ijaw Izons and Urhobos in Ovia North East and South West Local Government Areas, especially in
4814-459: The higher-grade, technically specified block rubbers such as SVR 3L or SVR CV or used to produce Ribbed Smoke Sheet grades. Naturally coagulated rubber (cup lump) is used in the manufacture of TSR10 and TSR20 grade rubbers. Processing for these grades is a size reduction and cleaning process to remove contamination and prepare the material for the final stage of drying. The dried material is then baled and palletized for storage and shipment. Rubber
4897-431: The international market spot price of a seemingly more profitable crop (for example palm oil ) surges in relation to rubber. For instance, during the 2020 and 2021 international COVID-19 pandemic , demand for rubber gloves surged, leading to a spike in rubber prices of about 30%. In addition to the pandemic, demand exceeded supply in part because long term plantations had been torn out and replaced with other crops over
4980-520: The latex sap. Charles Marie de La Condamine is credited with introducing samples of rubber to the Académie Royale des Sciences of France in 1736. In 1751, he presented a paper by François Fresneau to the Académie (published in 1755) that described many of rubber's properties. This has been referred to as the first scientific paper on rubber. In England, Joseph Priestley , in 1770, observed that
5063-402: The latex would anyway have coagulated by the time it reached the factory, the smallholder will coagulate it by any means available, in any container available. Some smallholders use small containers, buckets etc., but often the latex is coagulated in holes in the ground, which are usually lined with plastic sheeting. Acidic materials and fermented fruit juices are used to coagulate the latex –
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#17328515252245146-434: The latex-carrying vessels of the tree become blocked. It is of higher purity and of greater value than the other three types. 'Cup lumps' can also be used to describe a completely different type of coagulate that has collected in smallholder plantations over a period of 1–2 weeks. After tapping all of the trees, the tapper will return to each tree and stir in some type of acid, which allows the newly harvested latex to mix with
5229-416: The latex. There is growing concern for the future supply of rubber due to various factors, including plant disease, climate change, and the volatile market price of rubber. Producers of natural rubber are mostly small family-held plantations, often serving large industrial aggregators. High volatility in the price of rubber affects rubber plantation investment, and farmers may remove their rubber trees if
5312-443: The liquid "field latex" at about midday. The four types of field coagula are "cuplump", "treelace", "smallholders' lump", and "earth scrap". Each has significantly different properties. Some trees continue to drip after the collection leading to a small amount of "cup lump" that is collected at the next tapping. The latex that coagulates on the cut is also collected as "tree lace". Tree lace and cup lump together account for 10%–20% of
5395-528: The main source of latex rubber used during much of the 19th century. The rubber trade was heavily controlled by business interests but no laws expressly prohibited the export of seeds or plants. In 1876, Henry Wickham smuggled 70,000 Amazonian rubber tree seeds from Brazil and delivered them to Kew Gardens , England. Only 2,400 of these germinated. Seedlings were then sent to India , British Ceylon ( Sri Lanka ), Dutch East Indies ( Indonesia ), Singapore , and British Malaya . Malaya (now Peninsular Malaysia )
5478-399: The material is finely divided by shredding prior to its immersion. An ammonia solution can be used to prevent the coagulation of raw latex. Rubber begins to melt at approximately 180 °C (356 °F). On a microscopic scale, relaxed rubber is a disorganized cluster of erratically changing wrinkled chains. In stretched rubber, the chains are almost linear. The restoring force is due to
5561-561: The plantation expanded to Karnataka , Tamil Nadu and the Andaman and Nicobar Islands of India. Today, India is the world's 3rd largest producer and 4th largest consumer of rubber. In Singapore and Malaya, commercial production was heavily promoted by Sir Henry Nicholas Ridley , who served as the first Scientific Director of the Singapore Botanic Gardens from 1888 to 1911. He distributed rubber seeds to many planters and developed
5644-589: The preparation of dry rubber or transferred into air-tight containers with sieving for ammoniation. Ammoniation, invented by patent lawyer and vice-president of the United States Rubber Company Ernest Hopkinson around 1920, preserves the latex in a colloidal state for longer periods of time. Latex is generally processed into either latex concentrate for manufacture of dipped goods or coagulated under controlled, clean conditions using formic acid. The coagulated latex can then be processed into
5727-400: The preponderance of wrinkled conformations over more linear ones. For the quantitative treatment see ideal chain , for more examples see entropic force . Cooling below the glass transition temperature permits local conformational changes but a reordering is practically impossible because of the larger energy barrier for the concerted movement of longer chains. "Frozen" rubber's elasticity
5810-422: The previously coagulated material. The rubber/acid mixture is what gives rubber plantations, markets, and factories a strong odor. Tree lace is the coagulum strip that the tapper peels off the previous cut before making a new cut. It usually has higher copper and manganese contents than cup lump. Both copper and manganese are pro-oxidants and can damage the physical properties of the dry rubber. Smallholders' lump
5893-418: The primary cause of water pollution in the City of Benin. These are consolidated impacts of rainfall and construction development work carried out in the area, as well as a lack of plumbing codes. When Benin City experiences high pour of rain and flooding, water under flood tension enters the lines through breaks, inappropriately fixed joints and harmed pipes. The lack of plumbing codes or absence of such codes
5976-419: The related Scorzonera tau-saghyz , various Taraxacum species, including common dandelion ( Taraxacum officinale ) and Kazakh dandelion, and, perhaps most importantly for its hypoallergenic properties, guayule ( Parthenium argentatum ). The term gum rubber is sometimes applied to the tree-obtained version of natural rubber in order to distinguish it from the synthetic version. The first use of rubber
6059-460: The southeast and south for 350 km (218 miles), and Ondo State to the west. The modern borders of Edo State encompasses regions that were formerly the site of various empires and kingdoms of the second dynasty formed in the 11th century AD, the Benin Empire . The ancient city of Edo , the site of modern-day Benin City , was home to some of the largest earthworks in the world. In 1897,
6142-792: The state and their major occupation is farming. Languages of Edo State listed by LGA: Christianity and Islam are the major religions practiced in Edo State, although a minority of the population adhere to indigenous religions. The Catholic Church comprises the Archdiocese of Benin City [1] (1884 as Upper Niger) with 84 parishes under Archbishop Augustine Obiora Akubeze [2] (2011) and three suffragan dioceses of Auchi [3] (2002) with 56 parishes under Bishop Gabriel Ghiakhomo Dunia [4] (2002), Issele-Uku [5] (1973) with 94 parishes under Bishop Michael Odogwu Elue [6] (2003), and Uromi [7] (2005) with 18 parishes under Bishop Donatus Aihmiosion Ogun [8] (2014). The Anglican Province of Bendel (2002) in
6225-503: The state was declared as the " Republic of Benin " as Nigerian forces were to retake the region. The republic collapsed a day after the declaration as Nigerian troops overtook Benin City. Edo State was established on 27 August 1991 when Bendel State was split into Edo and Delta States . The Edo people political organization is expressed in a three-tier age group system that cuts across kin groups and make age, rather than line-age affiliation, with criterion of authority. Benin city itself
6308-564: The synthetic rate decreases with complete removal. More than 28 million tons of rubber were produced in 2017, of which approximately 47% was natural. Since the bulk is synthetic, which is derived from petroleum, the price of natural rubber is determined, to a large extent, by the prevailing global price of crude oil. Asia was the main source of natural rubber, accounting for about 90% of output in 2021. The three largest producers, Thailand , Indonesia, and Malaysia, together account for around 72% of all natural rubber production. Natural rubber
6391-435: The terminal high-energy pyrophosphate. The reaction produces a cis polymer. The initiation step is catalyzed by prenyltransferase , which converts three monomers of isopentenyl pyrophosphate into farnesyl pyrophosphate . The farnesyl pyrophosphate can bind to rubber transferase to elongate a new rubber polymer. The required isopentenyl pyrophosphate is obtained from the mevalonate pathway, which derives from acetyl-CoA in
6474-453: The way of the growing crystallites . Crystallization has occurred, for example, when, after days, an inflated toy balloon is found withered at a relatively large remaining volume. Where it is touched, it shrinks because the temperature of the hand is enough to melt the crystals. Vulcanization of rubber creates di- and polysulfide bonds between chains, which limits the degrees of freedom and results in chains that tighten more quickly for
6557-442: The world. As the cost of natural rubber has risen significantly and rubber products are dense, the shipping methods offering the lowest cost per unit weight are preferred. Depending on destination, warehouse availability, and transportation conditions, some methods are preferred by certain buyers. In international trade, latex rubber is mostly shipped in 20-foot ocean containers. Inside the container, smaller containers are used to store
6640-652: Was by the indigenous cultures of Mesoamerica . The earliest archeological evidence of the use of natural latex from the Hevea tree comes from the Olmec culture, in which rubber was first used for making balls for the Mesoamerican ballgame . Rubber was later used by the Maya and Aztec cultures: in addition to making balls, Aztecs used rubber for other purposes, such as making containers and to make textiles waterproof by impregnating them with
6723-736: Was first called 'india rubber,' because it came from the Indies, and the earliest European use of it was to rub out or erase. It is now called India rubber because it rubs out or erases the Indians." In India , commercial cultivation was introduced by British planters, although the experimental efforts to grow rubber on a commercial scale were initiated as early as 1873 at the Calcutta Botanical Garden . The first commercial Hevea plantations were established at Thattekadu in Kerala in 1902. In later years
6806-712: Was later to become the biggest producer of rubber. In the early 1900s, the Congo Free State in Africa was also a significant source of natural rubber latex, mostly gathered by forced labor . King Leopold II's colonial state brutally enforced production quotas due to the high price of natural rubber at the time. Tactics to enforce the rubber quotas included removing the hands of victims to prove they had been killed. Soldiers often came back from raids with baskets full of chopped-off hands. Villages that resisted were razed to encourage better compliance locally. (See Atrocities in
6889-419: Was likewise distinguished as one more reason for the water pollution in Benin City, The government of Edo state, under the leadership of Godwin Obaseki , have take a move to hasten and complete the proposed Port project that is on going in the Benin river. This project is fast track in order to improve the state Revenue in terms of many ways and transporting raw materials in and outside the state. this project
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