![]() Yellow cartridges are approved for organic vapors and acid gases. Gas and vapor cartridges are color-coded, with a white label to show they’re resistant to acid gases like chlorine, hydrogen sulfide and sulfur dioxide. The number indicates the percentage of airborne contaminants that are filtered out (95%, 99%, or 99.7% in the case of 100 masks). N-type masks are NOT resistant to oil, while R-type masks are RESISTANT and P-type masks are oil- PROOF. ![]() The letter reflects the resistance to oily mists.
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