Caoutchouc

(koo'-chook) [S. A.]. Rubber. The chief substance contained in the milky juice that exudes upon incision of a num- ber of tropical trees belonging to the natural orders Euphorbiacece, Artocarpacece, and Apo- cynacecE. The juice is a vegetable emul- sion, the caoutchouc being suspended in it in the form of minute transparent globules. When pure, caoutchouc is nearly white, soft, elastic, and glutinous; it swells up in water without dissolving ; the best solvents are carbon disulfid and chloroform. It melts at about 150 C. and decomposes at 200

Caoutchouc Resources
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