2300 R95 Particulate Respirator Featuring a collapse-resistant Dura-Mesh(®)shell and Softspun™ lining, the 2300 R95 Particulate Respirator includes an exhalation valve to make breathing cooler and easier. Suitable for most welding applications, with flame retardants added to the shell to help reduce flammability. NIOSH certified under 42 CFR84 to have a filter efficiency level of 95% or greater against oil and non-oil based particulates up to 10X PEL. 10 per box. Meets 42 CFR84 standard.