The Sundstrom Safety SR 710 High-Efficiency particulate filter is for use with the Sundstrom SR 500 PAPR fan unit. The SR 710 HE particulate filter protects against all types of particulate including dust, mold, lead, radioactive dust, asbestos, aerosol, and more. The filter efficiency meets and exceeds NIOSH criteria and is in fact 10 times more efficient than required by NIOSH. Each filter is tested twice before leaving production and must meet a filter efficiency of 99.997%. The casing of the filter is made of high-quality propylene plastic and is complete with a threaded connection ready for use.