1.nbc gas mask 2.ISO9001,GB2890-1995 3 ... which is suitable for different face.2.MF18type gas mask Specifications: Service life, min Penetration Leakage coefficient ... chloride, arsine, phosgene, chloropicrin, bromomethane, lewisite gas, mustard gas, sarin, vx gas, toxic smoke, and fume, benzene, hydrogen ... Usage maintenance and maintain4.1.The selection of gas mask 4.1.1. checking the position between ...