- Combination filter K1 behalf facemasks type N5500, N7700, N5400
Explanation designation filters: A - Organic gases and vapors of which the boiling point is above 65 ° C. For example, solvents, hydrocarbons etc. AX - Organic gases and vapors having a boiling point below 65 ° C. B - Inorganic gases and vapors, e.g., chlorine, cyanide, formaldehyde, hydrochloric acid, etc.. E - Acid gases and vapors, eg sulfur dioxide, etc.. K - Ammonia and organic amino derivatives. P - Solid and liquid particles, dust CO - Carbon monoxide