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 ?
Le caractere saisonnier du travail ne met pas en cause la structure de fiction marchande, a laquelle collecteurs de caoutchouc et ramasseurs de noix se trouvent identiquement assujettis, mais il pese probablement sur le rapport de force presidant a l'imposition des prix par les patrons: le travail des castanheiros est comparativement mieux <<retribue>> que celui des seringueiros.
And from notes left by his assistants we gather that the discovery of rubber had inspired him to add one more dimension to the project: With caoutchouc to serve as vocal cords, could the Bleeding Man be made not only to stand, digest, secrete, but also .
Heat from repeated firings--or cold weather--caused the caoutchouc buffer to lose its elasticity, with resulting gas leakage around the breech.
Serier, "La Guerre du Caoutchouc (1899-1903)", Revue Generale du Caoutchouc et des Plastiques 62: 654 (1985): 107-108.
Indians are said to be the first who used this white milky-like extract to make caoutchouc, the native name for rubbers, to erase marks, lines and drawings drawn on their wooden weapons.
Iran has also imported certain Malaysian goods and products including palm oil, chemical products, caoutchouc, industrial products and foodstuffs.
Driving further, after a couple of hundred kilometres through the green hell of the jungle, the Bolivian border town of Rio Branco appears, one of the most remote settlements within the Amazon region and the hometown of legendary caoutchouc workers' leader Chico Mendes.
On a etudie dans ce travail l'effet de l'ajout de caoutchouc sur les proprietes du nylon 66 renforce de fibre de verre.
Neanmoins, dans certains pays, notamment au Cambodge et en Chine, on a ajoute aux preservatifs des << perles >>, des clous en caoutchouc ou meme des crins qui sont douloureux et dangereux pour le partenaire, blessant le vagin et l'anus.
Processors of heat sensitive products such as polymers, caoutchouc, elastomers and foodstuffs now have the option for cryogenic ultra-fine grinding with a milling system incorporating the proven capabilities of the Hosokawa Alpine Contraplex 160C, a contra-rotating pin mill, available from Hosokawa Micron Ltd.
On peut noter quelques activites qui possedent un nombre important de contrats feminins telles que l'alimentation, les boissons et le tabac, les industries manufacturieres, la construction de machinerie, le caoutchouc et les matieres plastiques ou la fabrication de produits metalliques.