(¦kär·bən ¦blak) (chemistry) An amorphous form of carbon produced commercially by thermal or oxidative decomposition of hydrocarbons and used principally in rubber goods, pigments, and printer's ink. gas black
An amorphous form of carbon produced commercially by thermal or oxidative decomposition of hydrocarbons. It is used principally in rubber goods, pigments, and printer's ink. It is not an inert filler but enhances and reinforces various properties of rubber.
Manufacturing processes may be classed as contact, furnace, or thermal. In the channel (contact) process, natural gas is burned with insufficient air for complete combustion. The smoky flame from individual burners impinges on a cool channel iron, and carbon black deposited on the channel is removed by a scraper blade. In the furnace process, the hydrocarbon and air are fed into a reactor. Combustion of part of the hydrocarbon raises the temperature to 2000–3000°F (1100–1700°C), causing decomposition of the unburned hydrocarbon to carbon black. A water spray quickly cools the hot reaction products, and the finely divided black is recovered by cyclones and bag filters, In the thermal process, natural gas is decomposed to carbon and hydrogen by heated refractories.