... . 2. good quality. 3. for air filtration Features: 1. Nonwoven filter paper for air filters has high strength, low shrink ratio ... , heat resistance, good stability and air permeability. 2. It is waterproof, light-stopped, acid/alkali ... compressed air , oxygen,nitrogen, fuel gas etc, and can be used in serveral kinds of vehichle filter element. Filter paper for Air filtration