NIOSH has two designations for oily-based particle disposable respirators - R95 and P95. The "R" rating is said to be "somewhat resistant to oil". The "P" rating is said to be "strongly resistant to oil". In other words, the R95 has an 8 hour service life. The P95 has a 40 hour or 30 day service life (whichever comes first).

Respirators with valves are ideally suited for work settings that involve heat, humidity, or long periods of wear. *3M™ recommended for relief against nuisance levels of organic vapors. Nuisance level refers to concentrations less than the OSHA PEL or applicable government occupational exposure limits, whichever is lower.

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2024年1月22日 · N95 air masks are the basic air pollution masks that everyone should wear for protection against air pollution. It can filter 95% of all air pollutants including some part of PM2.5 pollutants. But this cannot protect you against oil-based pollutants.

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R-series can prevent oil, but the lifespan is rather short; P-series can prevent oil for a longer period. NIOSH standard suggests that R-series should be used less than 8 hours. If you cook for an hour every day, it is recommended to change the R-series mask once a week, while P-series last longer. Free Guide to Breathing Safe.

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2020年10月11日 · Masks rated 95 can filter up to 95% of particulates of 0.3 microns or bigger in diameter, while 100 rated respirators filter up to 99.97% of the contaminants. Likewise, KN95 is a grade specified by equivalent Chinese national standard (GB2626-2006).

2019年2月27日 · NIOSH-APPROVED R95 for at least 95 percent filtration efficiency against solid and liquid aerosols including oils; CARBON LAYER helps reduce nuisance levels of organic vapors such as certain solvents, degreasers, and resins 3M recommended for relief against nuisance level organic vapors.