... . gas mask(Silica Gel mask) . 2.ISO9001,CEcertificate,GB2890-1995 3.supply sample. 4.Enlarging the field of vision 802 901 ... , cyanogens chloride, arsine, phosgene, chloropicrin, bromomethane, lewisite gas, mustard gas, sarin, vx gas, toxic smoke, and fume, benzene, hydrogen phosphide, chlorine ... 4.Usage maintenance and maintain4.1.The selection of gas mask 4.1.1. checking the position between glasses ...