N95 and R95 Respirators - The Difference? - Major Safety- ขายหน้ากาก 3m p95 ,The P95 has a 40 hour or 30 day service life (whichever comes first). You can read more about this in the following NIOSH article: NIOSH-Approved Particulate Filtering Facepiece Respirators . To sum up: a N95 disposable respirator does not protect against oily particles; a R95 does; a P95 also does and has a longer service life than the R95.

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