... seal which is suitable for different face.2.MF18type gas mask Specifications: Service life, min Penetration Leakage coefficient ... , cyanogens chloride, arsine, phosgene, chloropicrin, bromomethane, lewisite gas, mustard gas, sarin, vx gas, toxic smoke, and fume, benzene, hydrogen phosphide, chlorine ... our eyes is 10mm higher than the horizontal center line, that proves the size is correct. And if ...