For protection against solid and liquid particles, and ozone up to 10 x OEL, get 3M™ Particulate Filters, 2138. They also offer additional protection against organic vapour and acid gases below OEL. Our lightweight, P3 R filters combine protection with comfort. They’re versatile enough to use across our range of reusable half and full-face masks, for safe working in hazardous environments. They offer low breathing resistance and good balance when connected to your mask, and their flexibility means they fit comfortably under welding shields. They can be clicked into place quickly and easily using the 3M™ Bayonet Filter Attachment System, and they can be used with any 3M™ Reusable Masks with a bayonet-style connection