| Filter Efficiency |
N-series particulate
filters
Not resistant to oil. |
R-series particulate
filters
Oil-resistant. |
P-series filters
Oil-proof. |
95% |
N95
Not resistant to oil.
May be used for solid particulate or liquid particulate hazards.
No time limitations
Moderate filter efficiency. |
R95
Oil-resistant.
May be used for solid and liquid particulate hazards.
Time limitation: 8 hours or manufacturer recommendation.
Moderate filter efficiency. |
P95
Oil-proof.
Time limitation: manufacturer recommendation, usually more than
8 hours.
Moderate filter efficiency. |
99% |
N99
Not resistant to oil.
May be used for solid particulate or liquid particulate hazards.
No time limitations.
High filter efficiency. |
R99
Oil-resistant.
May be used for solid and liquid particulate hazards.
Time limitation: 8 hours or manufacturer recommendation.
High filter efficiency. |
P99
Oil-proof.
Time limitation: manufacturer recommendation, usually more than
8 hours.
High filter efficiency. |
99.97% |
N100
Not resistant to oil.
May be used for solid particulate or liquid particulate hazards.
No time limitations.
Very high filter efficiency.
|
R100
Oil-resistant.
May be used for solid and liquid particulate hazards.
Time limitation: 8 hours or manufacturer recommendation.
Very high filter efficiency. |
P100
Oil-proof.
Time limitation: manufacturer recommendation, usually more than
8 hours.
Very high filter efficiency.
NOTE: long-term exposure to oil can lower efficiency to 95%. |