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N95 is the most popular series of particulate respiratory masks that meet US government standards. NIOSH – National Institute for Occupational Safety and Health – Conducts face mask tests to reduce exposure to air pollution. NIOSH has nine grades of approval, N95, N99, N100, R95, R99, R100, P95, P99, P100, organized by oil compatibility, and filter efficiency.

The letter shows how the filter tests under conditions of exposure to oil aerosols:

N95, N99, and N100 Mask

These filters should not be used with oil aerosols. They should be used in environments exposed to particulate matter that is oil-free. In many cases, n-respirators can be used repeatedly.

R95, R99 and R100 Mask

These filters are oil resistant. R-type respirators can be used in an atmosphere containing solid particles that pose any solid or liquid hazard, including hazardous to oil. These are disposable masks.

P95, P99, and P100 Mask

These filters are oil resistant. These respirators can be used in any environment exposed to hazardous particles. R-respirators are subject to time limits for use.

The filter efficiency number refers to the percentage of particles in the air that were removed during testing: 95%, 99%, and 100%. If the mask is NIOSH approved, an approval class stamp will be printed on the respirator.

NIOSH approved masks are also available in various sizes, and a well-fitting mask is very important. When testing an N95 mask or other particulate respirator mask test kit, follow these simple steps:

1. Firmly press the mask (respirator) to the face with the external side nosepiece bridge of your on the nose.

2. Pull and place the upper head tape over the back of your head over your ears. Pull the lower headband over your head and place it under your ears.

3. Using both hands, mold the metal nosepiece in the shape of a nose.

4. To check the correct fit, close the respirator with both hands and exhale vigorously. If air flows around your nose, tighten the nosepiece: if air flows around the edges of the respirator, change the position of the headbands so that they fit better, and check again until there is air leakage.

Before choosing the right mask, it is also recommended that you talk with experienced industrial safety personnel about evaluating your specific environment.

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