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Dust Mask Respirators
Feb 10, 2017


Dust Mask Respirators come in many configurations and ratings. The primary ratings are N, P 

and R. Following the letter rating is a number, generally 95,99 or 100 which relates to how 

much the filter has been measured to remove of particulate matter of 0.3 microns in diameter 

or greater.

Dust Mask Respirator Ratings:

The first digit is a letter that corresponds to its resistance to oil.The second and third 

digits are numbers that denote the percentage of particulates the respirator can filter out. 

For example, a P95 respirator is an oil proof respirator that filters out 95% of particles.

Respirator Rating Letter Class

N - Not oil resistant

R - Resistant to oil

P - Oil Proof

Respirator Rating Number Class

95 - Removes 95% of all particles that are at least 0.3 microns in diameter

99 - Removes 99% of particles that are at least 0.3 microns in diameter

100 - Removes 99.97% of all particles that are 0.3microns in diameter or larger


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