... seal which is suitable for different face.2.MF18type gas mask Specifications: Service life, min Penetration Leakage coefficient ... acid, cyanogens chloride, arsine, phosgene, chloropicrin, bromomethane, lewisite gas, mustard gas, sarin, vx gas, toxic smoke, and fume, benzene, hydrogen phosphide, chlorine ... , and on the contrary that indicate the size is big.4.1.2. Pressing the connector of the canister ...