Nomex bag 1.high quality filter fabric fessional sewing 3.first brand sewing machine petitive price 1.Can filter normal atmospheric temperature or high-temperature gas including corroding gas mixed with acid and alkali 2.Widely used in metallurgy, chemical industry, building materials, smelting, generating electricity, pottery, machinery, mine, petroleum, dyestuffs, food, grain processing ideal material to purify and filter gas