| A solution of the dichloride with excess of sulphur in crude benzol is used for vulcanising caoutchouc. |
| Dr Rollfs advises melting a piece of caoutchouc at the end of a wire, and introducing it while warm. |
| Caoutchouc, as it exudes from the trees, is a milk-like emulsion, wherein globules of caoutchouc proper are suspended in a gummy solution. |
| A caoutchouc tube passes through the cap, and is connected inside the bottle with a straight glass pipe. |
| They are replaced by a thin strip of caoutchouc, which is wound round in a spiral form, at the end of the ordinary wire handle. |
| By adding a concentrated acid, the conversion of isoprene into caoutchouc artificiel, or artificial rubber, was speeded up a lot. |
