All Moldex Particulate Filters are NIOSH certified • P100 Particulate filter disks are lighter than traditional filter cartridges • P100 Particulate filter disks allow for wider field of vision because of low profile design • P100 Particulate filters are encased in plastic for durability and rough handling • P100 Particulate filter disks fit under welding helmets • Fiberglass free • P100 Particulate filter disks are easy twist on/twist off, with bayonet style attachment P100 Filter Disks have efficiency level of 99.97% or greater against both oil and non-oil based particulate aerosols • Piggyback the 7940 P100 Particulate Filter Disk with any Moldex gas/vapor cartridge using the 7920 Piggyback adaptor • Meets heat and flame resistance in accordance with ANSI/ISEA 110-2009 Section 7.11.1. • 100% PVC-Free, like all Moldex products & packaging – for a greener alternative