If you are looking at a 3M half face respirator and trying to decide between a P95 and P100 filter, the key difference is filtration efficiency. Both are P class filters rated for use against oil based aerosols, but P95 filters have a minimum filtration efficiency of 95%, while P100 filters have a minimum efficiency of 99.97%.
This guide explains the 3M P95 vs P100 filter comparison in plain language, breaks down the NIOSH...
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