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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. Als…

See Caoutchin.

lammable, volatile, oily, liquid hydrocarbon, obtained by the destructive distillation of caoutchouc.

ometimes also from the naseberry or sapodilla (Sapota zapotilla). It is more plastic than caoutchouc and more elastic than gutta-percha, as an adulterant of which it is used in England. It is used largely in the United States in making chewing gum.

A material for carpeting or floor covering, made of ground cork and caoutchouc or India rubber.

A pair of fluted rolls for grinding caoutchouc. Knight.

ery elastic fibers which are but slightly affected by acids or alkalies. -- Gum elastic, caoutchouc.

ernal pressure or altering force; springiness; tendency to rebound; as, the elasticity of caoutchouc; the elasticity of the air.

in, of a blackish brown color, occurring in soft, flexible masses; -- called also mineral caoutchouc, and elastic bitumen.

ue, a fluid preparation of glue and acetic acid oralcohol. -- Marine glue, a solution of caoutchouc in naphtha, with shellac, used in shipbuilding.

, a species of rock rose.-- Gum dragon. See Tragacanth. -- Gum elastic, Elastic gum. See Caoutchouc. -- Gum elemi. See Elemi. -- Gum juniper. See Sandarac. -- Gum kino. See under Kino. -- Gum lac. See Lac. -- Gum Ladanum, a fragrant gum yielded by several Oriental species of Cistus or rock rose. -- Gum passages,…

It dissolves in oils and ethers, but not in water. In many of its properties it resembles caoutchouc, and it is extensively used for many economical purposes. The Mimusops globosa of Guiana also yields this material.

the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.

), a proof impression from an engraved plate, taken on India paper. -- India rubber. See Caoutchouc. -- India-rubber tree (Bot.), any tree yielding caoutchouc, but especially the East Indian Ficus elastica, often cultivated for its large, shining, elliptical leaves.

. See Caoutchouc.

An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.C5H8 -- unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons

A caoutchouc like substance obtained from the milky juice of the East Indian Euphorbia Kattimundoo. It is used as a cement.

principles of the plants, whether aromatic, bitter, or acid, and in many instances yields caoutchouc upon coagulation.

A white, amorphous, tenacious substance resembling caoutchouc, and obtained as an insoluble residue of mastic.

powder for coloring purposes. -- Mineral candle, a candle made of paraffine. -- Mineral caoutchouc, an elastic mineral pitch, a variety of bitumen, resembling caoutchouc in elasticity and softness. See Caoutchouc, and Elaterite. -- Mineral chameleon (Chem.) See Chameleon mineral, under Chameleon. -- Mineral charcoa…