If you look they have ratings:
Quote:
N95 - Filters at least 95% of airborne particles. Not resistant to oil.
Surgical N95 - A NIOSH-approved N95 respirator that has also been cleared by the Food and Drug Administration (FDA) as a surgical mask.
N99 - Filters at least 99% of airborne particles. Not resistant to oil.
N100 - Filters at least 99.97% of airborne particles. Not resistant to oil.
R95 - Filters at least 95% of airborne particles. Somewhat resistant to oil.
P95 - Filters at least 95% of airborne particles. Strongly resistant to oil.
P99 - Filters at least 99% of airborne particles. Strongly resistant to oil.
P100 - Filters at least 99.97% of airborne particles. Strongly resistant to oil.
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The typical dust mask is going to be N95, the oil resistant ones are for spray painting. The disposable N100 are pretty expensive, at least 7 or 8 dollars each. The N99 you can get for about $2/3 each.
If you want to go all out just get a regular reusable respirator, they come with replacement cartridges.
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