Ultra-thin pure flexible graphite calendered sheet and method of

Details Ultra-thin pure flexible graphite calendered sheet and method of Ultra-thin pure flexible graphite calendered sheet and method of

1990-08-30

1992-09-22

Kunemund, Robert

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

423448, 423460, 252502, 264175, C01B 3104

Patent

active

051495180

ABSTRACT:
A process for forming pinhole free ultra-thin flexible sheet material from natural graphite comprising treating low ash natural graphite particles with an oxidizing agent to intercalate the graphite, introducing the particles after they are dried to less than 2% by weight water into a furnace preheated to at least 2000.degree. F. to cause rapid expansion to a specific volume of at least 800 cc/gm and compressing the expanded graphite to below 8 mils in thickness with a density of less than 1.3 g/cc.

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