fibers from palmetto synthetics sc usa or bicomponent fibers from fiber innovation technology inc tn usa either alone or in blends with other staple fibers or spunlaid nonwoven web containing fire resistant continuous filaments made using polyester polyethylene terephthalate 50 80 grade f61 hc pet resin from eastman chemicals tn usa 10 30 pbt resin from ticona n j usa 20 10 nst 10470 pet fr concentrate from nanosyntex inc tn usa and or nylon nylon 6 basf grade bs700 or nylon 66 an inner layer is made of carded or spunlaid web containing either continuous filaments of higher melting fire resistant polyester and or nylon or a carded web containing fire resistant polyester and or nylon or bicomponent staple fibers in blends with fire resistant viscose rayon fibers lenzing lyocell fr fibers suitable fiber lengths for staple fibers range from 0 5 5 inches and more specifically from 1 3 inches and fineness for staple fibers and continuous filaments range from 0 5 5 denier per filament dpf and more specifically 1 3 dpf the cross section for continuous filaments is uniform round with bicomponent polymer splittable segmented pie or bicomponent core and sheath configuration as shown in fig3 in the case of bicomponent filaments and staple fibers pet is the main component at 50 80 by weight and nylon 6 or pbt or ptt is the minor component at 20 50 by weight more specifically in the case of the core sheath configuration pet forms the core at 70 80 by weight and lower melting nylon 6 or pbt or ptt forms the sheath at 20 30 by weight the basis weight for individual nonwoven webs ranges from 0 5 10 oz yd 2 ard more specifically from 1 5 3 oz.