SR510 Particle Filter (P3)Sundstrm SR510 Particle Filter (P3) or SR 210 310, provide P3 protection with full face masks and P2 protection with a half mask due to the limitation of the face piece. A half mask with particle filter or combination filter is approved for up to 10 times the TLV. The filter flange features an O ring that optimises the seal to the front rim of Sundstrm gas filters. SPECIFICATIONS Filter Rating: P3 Materials: Plastic polypropylene, 100 g of activated