2097 P100 PARTICULATE FILTER has been certified as being 99.97% efficient at removing solid and liquid particles including those containing oil.Used largely for welding,this filter is recommended for ozone protection up to 10x the LTV and welding odor relief(organic vapors below the OSHA PEL).Designed for use only with the 3M 6000 and 7000 series half and full facepieces.