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 ?
La police a nie l'utilisation d'une arme a feu ou des balles en caoutchouc pour disperser une manifestation d'Um Dom *el-Bechir appelle a elever la representation de l'Afrique dans les institutions internationales.
In the following year, the Society for the Promotion of Christian Knowledge in London, reflected upon how widespread the use of gutta percha was in its publication Caoutchouc and Gutta Percha:
The centre of the open part of the sheet metal was covered with caoutchouc sheet having holes for pile installation.
Domestic caoutchouc price continues to rise in 2012due to the droughty weather in Yunnan and the rising crude oil price.
He protectively grabs the phonograph and begins his tirade against the world of his wealthy hosts saying that he is the theater in the jungle and the inventor of caoutchouc, and that only through Fitzcarraldo does caoutchouc become word.
6) Les gestionnaires de l'Etat Independant du Congo pouvaient tout gentiment massacres des populations congolaises, coupes les bras aux hommes et femmes inaptes au travail de cueillette du caoutchouc dont le roi Leopold II avait alors besoin pour renflouer ses propres finances d'anthropophile et de civilisateur.
Strap: natural rubber, caoutchouc featuring bold cut signature Tiret "T;" adjustable belt buckle closure.
23) Voir par exemple la variante du motif macabre des osselets : << Quand il se baissa, la dechirure au milieu du dos, entre les omoplates, s'ouvrit de facon caracteristique, prit la taille d'une piece de monnaie, et montra au hasard trois vertebres aigues, jouant sous la peau tendue comme des ongles sous une membrane de caoutchouc >> (Le Proces-verbal 16).
Antoine overcame this problem by the use of his patented caoutchouc buffer, a moveable, Gutta Percha (an early form of industrial rubber) sleeve fitted to the front of the bolt.
Director of Roads Complementary Works Department at GAM, Engineer Amjad Ayoub, pointed out that the water flow on houses in Um Al Basateen region was caused by the water amount running in a natural stream which carried some residuals as trees and caoutchouc (rubber), closing the water boxes, which eventually caused the water fluid.
Ces tulles sont fabriquees de feuilles de caoutchouc qui absorbent les vibrations creees par les pas des passagers et les emmagasinent dans des condensateurs d'energie.
On faisait des semelles de chaussures avec des roues de voiture, des roues en caoutchouc, yo te ka kriye sa "Michelin" .