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graphite US English

A gray, crystalline, allotropic form of carbon that occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors

pyrolytic graphite US English

A strong, heat-resistant form of graphite with a highly ordered structure, deposited from vaporized products of hydrocarbon pyrolysis and used as a coating, reinforcing, or structural material in rocket motors, missile nose cones, furnaces, etc.