... for air filter high strength,low shrink,anti-heat,stability,ari permeability; waterproof, mothproof,non-poisonos Filter paper for air ... high strength,low shrink ratio,heat resistance,good stability and ari permeability .It is waterproof,mothproof,non-poisonous.light-stopped,acid ... filtrate and pruify kinds of noncorrosive gases,such as compressed ari,oxygen,nitrogen,fuel gas etc,and can be used in ...