VULCANITE, a useful insulating material, manufactured by over-vulcanizing rubber, whence its name. Rubber rolled with a considerable proportion of sulphur and heated to a temperature of about 15o°, becomes hard and capable of taking a high polish.
It can be either moulded in manufacture to any required form or cut or carved when hard. It is very useful to the electrician, and, under the name of ebonite, is much used for combs, etc.