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A "P-100" respirator is designed to provide a high level of protection against airborne particulates, including oil mists. The key characteristic that distinguishes P-100 respirators is their capability to filter out at least 99.97% of airborne particles, including those that are oil-based. This makes them highly effective for use in environments where oil mists are present.

"P" in P-100 indicates that the respirator is tested for its effectiveness against both oil-based and non-oil-based particles, ensuring that it can provide good protection in a variety of situations. This quality makes them a preferred choice for workers in industries where oil mists might be present, such as manufacturing or cleaning.

While other types of respirators may have limitations concerning oil-based aerosols, the P-100 classification confirms its resilience and efficiency when it comes to filtering out fine particulates, including oils, which is why the term "oil proof" is often associated with its performance.