30 failed13 ncf peb cotton 10 15 75 passed14 ncf peb cotton 5 15 80 failed15 ncf peb pe 5 20 75 failed16 ncf peb pe 7 5 20 72 5 borderline17 lcf peb cotton 25 15 60 passed18 opf peb cotton 50 15 35 failed19 ncf peb cotton 20 15 65 passed20 ncf peb wool 5 15 80 failed21 ncf peb wool 10 15 75 passed22 ncf sc peb cotton 20 15 65 passed23 opf peb pe 50 20 30 failed______________________________________ ncf nonlinear carbonaceous fiber lcf linear carbonaceous fiber lcf sc linear carbonaceous fiber with small amplitude crimp peb 8 denier polyester binder fiber of 410 kodel trademark pp polypropylene pe 6 denier 2 34 staple dupont dacron trademark 164 fob polyester cotton nontreated 11 2 34 cotton opf stabilized polyacrylonitrile fiber nomex trademark of an aramid fiber available from e i du pont amp co following the procedure of example i similar tests were performed on panels of 1 8 34 to 3 16 34 thickness prepared according to the results as shown in the following table ii table ii______________________________________sample sampleno comp composition pass or fail______________________________________1 ncf peb pe 30 20 51 passed2 ncf peb pe 30 20 50 passed3 nomex u2122 peb pe 20 20 60 failed4 nomex u2122 peb pe 50 20 30 failed5 ncf peb pe 20 20 60 passed6 lcf peb pe 50 20 30 passed______________________________________ following the procedure of example 1 the.