caoutchouc


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caoutchouc

(kou`cho͝ok), natural rubberrubber,
any solid substance that upon vulcanization becomes elastic; the term includes natural rubber (caoutchouc) and synthetic rubber. The term elastomer is sometimes used to designate synthetic rubber only and is sometimes extended to include caoutchouc as well.
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 obtained as a latexlatex,
emulsion of a polymer (e.g., rubber) in water (see colloid). Natural latexes are produced by a number of plants, are usually white in color, and often contain, in addition to rubber, various gums, oils, and waxes.
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 from various tropical plants, e.g., the Pará rubber treePará rubber tree
, large tree (Hevea brasiliensis) of the family Euphorbiaceae (spurge family), native to tropical South America and the source of the greatest amount and finest quality of natural rubber.
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. It is much more elastic than balatabalata
, nonelastic natural rubber obtained as a latex from the South American tree Manikara bidentata and from related trees. Its properties are similar to those of gutta-percha, and its processing and uses are essentially the same. It is sometimes called gutta balata.
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 or gutta-perchagutta-percha
, natural latex obtained from Palaquium gutta and several other evergreen trees of East Asia. The latex, collected by felling or girdling the tree, is allowed to coagulate and is then washed, purified, and molded into bricks for shipping.
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. It is the most familiar and widely used of the natural rubbers. It is usually processed by coagulating the latex and by milling or smoking the solid rubber. It is then further treated, e.g., by vulcanizationvulcanization
, treatment of rubber to give it certain qualities, e.g., strength, elasticity, and resistance to solvents, and to render it impervious to moderate heat and cold.
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caoutchouc

[kau̇′chük]
(materials)
Formerly, crude rubber which had been cured over a fire into a solid, dark mass for shipment.
References in periodicals archive ?
De la langue de bois a la langue de caoutchouc', Libre, 1978, 4, pp.
Heat from repeated firings--or cold weather--caused the caoutchouc buffer to lose its elasticity, with resulting gas leakage around the breech.
The scientist was fascinated with the magical power of erasing caoutchouc has, which outdoes the capability of pieces of bread Europeans used for the same purpose.
L'organisation de jeunesse sahraouie, l'Union de la jeunesse de Saguia El Hamra et Rio de Oro (UJSARIO) a egalement condamne les violences et la detention forcee de nombreux jeunes Sahraouis a la suite de ces manifestations pacifiques, notamment l'utilisation de balles en caoutchouc, et a presente ses condoleances a la famille la jeune Sabah et tout le peuple sahraoui.
Elu president du Liberia le 26 decembre dernier avec 61,5% des voix, George Weah, 51 ans, a reellement du pain sur la planche maintenant qu'il a ete appele a presider aux destinees d'un des Etats les plus pauvres du monde, a le developper et a y maintenir la paix car, outre la necessaire lutte contre la corruption qui gangrene le pays, le nouvel homme fort du Liberia devra faire face a de nombreux defis notamment transformer une economie en recession encore largement dependante du caoutchouc et du minerai de fer et repondre aux espoirs de cette jeunesse qui l'a porte au pouvoir.
Mais quelques heures plus tot a Brasilia, la police bresilienne a une nouvelle fois disperse avec des gaz lacrymogenes et des balles en caoutchouc une manifestation devant le stade de Brasilia contre la facture des grands evenements sportifs dans le pays.
Elle resulte egalement du recul de la production des "meubles et industries diverses" de 9,4 pc, des "machines et equipements" de 3,8 pc, des "produits en caoutchouc ou en plastique" de 2,5 pc et des "produits du travail du bois" de 5,1 pc, precise le HCP.
Association Francaise des Ingenieurs et Cadres du Caoutchouc et des Polymeres, International Rubber Conference 2013, Palais des Congres Porte Maillot, Paris, France, www.irc2013.com--March 20-22.
Among the items exported during the above mentioned period, the export of mineral products is valued at $1 billion and 193.5 million; chemical products and related industries at $1 billion and 187.6 million; metals at $306.9 million, plastics and caoutchouc at $301.4 million.