| Aluminium Gas mask filter cartridges activated Carbon filter : |
| Canister protection type | Protective gas | For example | Remarks |
| New model | Old model |
| Brown | A | 3# | Organic gas or steam | Benzene,anilines,carbon tetrachloride,nitrobenzene, chlorpicrin | Common types |
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| Green | K | 4# | Ammonia and organic derivatives of ammonia | Ammonia |
| Yellow | E | 7# | SO2 ,other acid gas or steam | SO2 |
| White | CO | 5# | CO | CO | Confirm the gas type before using |
| Blue | H2S | 8# | H2S | H2S |
| Gray | B | 1# | Inorganic gas or steam | Hydrogen chloride,Hydrocyanic acid,Chlorine |
