| 摘要 |
A scrimless, dimensionally stable filter felt suitable for high temperature gas filtration is comprised of at least 80% by weight poly(m-phenylene isophthalamide) staple fibers having at least a low degree of crystallinity and a staple length of 4 to 16 cm., and has a felt density of 0.15 to 0.4 g./cm.3 and an air permeability of 3 to 30 m.3/min./m.2 (0 DEG C. basis pressure differential = 1.27 g./cm.3.
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