... , cyanogens chloride, arsine, phosgene, chloropicrin, bromomethane, lewisite gas, mustard gas, sarin, vx gas, toxic smoke, and fume, benzene, hydrogen phosphide, chlorine ... :22kg 4.Usage maintenance and maintain4.1.The selection of gas mask 4.1.1. checking the position between glasses ... the fillets4.2.7 after a long time wearing, there would have accumulation of sweat, especially in summer days, ...