Our comprehensive selection of particulate respirator masks contains several products, including:N95 particulate respirators(8210; 8211; 8511; 9210; 9211): N95 masks are required to prevent more than 95 percent of airborne contaminants from entering a user's airway. Masks with an N" designation offer protection against solid and non-oil-based particles. Each N95 mask/particulate respirator in our catalog is approved by the National Institute of Occupational Safety and Health.R95 particulate respirators(3M 8240; 3M 8246; 3M 8247): R95 particulate respirator masks must be at least 95 percent efficient against airborne contaminants in laboratory tests. R95 masks are somehow resistant to oil-based particles. All the R95 particulate respirator masks in Enviro Safety Products' inventory are NIOSH-approved.