Patent ID: 8347420

Claim:
A heat and flame resistant thermal liner sub-assembly comprising (a) at least one thermally expanding flame resistant fabric consisting of crimped, heat resistant para-aramid fibers held in a state of compression by a thermoplastic binder, the binder being present in an amount of 15 to 45 percent by weight, based on the weight of the binder plus crimped fiber; and (b) at least one thermally stable flame resistant fabric adhered to an outer surface of the thermally expanding flame resistant fabric by a thermoplastic binder, the surface contact between the thermally stable fabric and the thermally expanding flame resistant fabric being 80 to 100%; wherein, when the thermal liner sub-assembly is exposed to heat or flame, the thermally stable flame resistant fabric remains flat and dimensionally stable to minimize shrinkage of the thermally expanding flame resistant fabric, the liner increases its thickness in a range from 100% to 1100% and shrinkage of the liner sub-assembly in a machine direction and in a cross direction is no greater than 10%; and the thermal liner sub-assembly has an afterflame of no greater than 2 seconds when exposed to flame in accordance with ASTM D6143-99.