Which designation indicates resistance to oil?

Which designation indicates resistance to oil?

• A. R
• B. P
• C. N
• D. H

Answer: (A)

In respirator filter labeling, three series tell you how a filter handles oil in the air: N, R, and P. N means not resistant to oil, so it’s not suitable for oil aerosols. R means oil resistant, usable with oil-containing aerosols for a limited period. P means oil proof, designed for prolonged exposure to oil aerosols. Since the question asks which designation indicates resistance to oil, the answer is the R designation, which explicitly denotes oil resistance. If oil aerosols are present, you’d choose R or P, with R for shorter-term use and P for longer exposure.

In respirator filter labeling, three series tell you how a filter handles oil in the air: N, R, and P. N means not resistant to oil, so it’s not suitable for oil aerosols. R means oil resistant, usable with oil-containing aerosols for a limited period. P means oil proof, designed for prolonged exposure to oil aerosols. Since the question asks which designation indicates resistance to oil, the answer is the R designation, which explicitly denotes oil resistance. If oil aerosols are present, you’d choose R or P, with R for shorter-term use and P for longer exposure.