Flexible carbon sheet and process for producing the same

Abstract From the Canadian patent

Disclosed herein is a flexible carbon sheet produced by carbonizing a composite material comprising carbon fibers having an average length 6 to 50 mm and having been treated at a temperature of at least 1,500°C and a binding agent, wherein carbon lumps derived by carbonizing the agent upon calcination are dispersed in a matrix of the carbon fibers and restrain a plurality of the fibers and bound loosely with the fibers so as to provide a flexibility expressed by aratio D/d, of the sheet not more than 200 wherein D is a diameter of curvature, just before the breakage when the sheet is bent and d is a thickness of the sheet wherein the sheet has a tensile strength of at least 0.05 kg/mm2 an …