Limbach, Limbach & Sutton
Electrically heatable sheet prepared by paper
 An electrically heatable sheet contains 3 to 20% by weight of carbon fibers and 97 to 80% by weight of natural pulp. The carbon fibers consist of at least two groups of different lengths, each of the carbon fibers of one group having a length of not shorter than 3 mm and shorter than 5 mm, each of the carbon fibers of the other group having a length of not shorter than 5 mm and not longer than 10 mm. The carbon fibers is selected from the group consisting of pitch type carbon fibers, polyacrylonitrile type carbon fibers and mixtures thereof. The sheet has a thickness of not thicker than 150 .mu.m and a basis weight of not larger than 55 g/m.sup.2. 
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H05B H05B H05B H05B H05B H05B H05B
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Makoto
Nishimura