What does 'N', 'R', and 'P' signify in Oil Mist Resistance ratings?

The designation of 'N', 'R', and 'P' in Oil Mist Resistance ratings directly refers to the resistance level of respirators to oil mist exposure. These ratings are important for determining the appropriate respiratory protection needed in environments where oil mist is present.

• 'N' stands for Not resistant to oil, indicating that the respirator should not be used in environments where oil aerosols are present.

• 'R' indicates a limited oil resistance, meaning the respirator can be used in environments with some oil exposure but not for extended periods.

• 'P' represents oil-proof, showing that the respirator provides a high level of protection against oil mist and can be used in environments with heavy oil exposure.

Understanding these classifications is crucial for selecting the right respirator for specific environments to ensure adequate protection against respiratory hazards associated with oil mist.