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Τι (ποιος) είναι caoutchouc - ορισμός

POLYMERS OF THE ORGANIC COMPOUND ISOPRENE, WITH MINOR IMPURITIES OF OTHER ORGANIC COMPOUNDS; REFINED FROM LATEX HARVESTED FROM RUBBER TREES

Rubber mixing; Rubbers; Caoutchouc; India-Rubber; India rubber; India-rubber; Gum Elastic; Indiarubber; Rubber; Gum rubber; Production of rubber; Rubbery; Amazonian rubber

$Rubber latex elasticity$
$rubber tree]], [[Cameroon]]$
$Rubber latex$
$Torn latex rubber dry suit wrist seal$

Caoutchouc

·noun A tenacious, elastic, gummy substance obtained from the milky sap of several plants of tropical South America (·esp. the euphorbiaceous tree Siphonia elastica or Hevea caoutchouc), Asia, and Africa. Being impermeable to liquids and gases, and not readly affected by exposure to air, acids, and alkalies, it is used, especially when vulcanized, for many purposes in the arts and in manufactures. Also called India rubber (because it was first brought from India, and was formerly used chiefly for erasing pencil marks) and gum elastic. ·see Vulcanization.

caoutchouc

n.

India-rubber, gum-elastic.

Caoutchouc

India rubber; a substance existing in an emulsion or solution in the juice of certain trees and vines of the tropics, whence it is obtained by coagulation and drying. The name "rubber" is due to the fact that one of its earliest uses was for erasing pencil marks by rubbing. It has a very high value as an insulator. The unworked crude rubber is called virgin gum; after working over by kneading, it is termed masticated or pure gum rubber; after mixture with sulphur and heating, it is termed vulcanized rubber. If enough sulphur is added it becomes hard, and if black, is termed ebonite; if vermilion or other pigment is also added to produce a reddish color, it is termed vulcanite. The masticated gum dissolves more or less completely in naphtha (sp. gr., .850) benzole, turpentine, chloroform, ether and other similar liquids.. The resistance per centimeter cube of "Hooper's" vulcanized India rubber, such as is used in submarine cables is 1.5E16 ohms. The specific inductive capacity of pure India rubber is 2.34--of vulcanized 2.94 (Schiller). Synonyms--India Rubber--Rubber.

Βικιπαίδεια

Natural 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, and Indonesia are three of the leading rubber producers.

Types of polyisoprene that are used as natural rubbers are classified as elastomers.

Currently, rubber is harvested mainly in the form of the latex from the 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 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 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.

https://en.wikipedia.org/wiki/Natural rubber

Παραδείγματα από το σώμα κειμένου για caoutchouc

1. The five–year contract for 340 million cubic meters of natural gas per year with Omsk Caoutchouc, one of the country‘s biggest manufacturers of synthetic rubber, is Sibneft‘s first major gas contract, a spokesman said Thursday.