Sundström SR510 Particle filter (Pack of 5)High performance particle filter class P3. The filter features an O ring that optimises the seal to the front rim of Sundstrm gas filters. Material: Plastic polypropylene. No metal parts. Usage: Used against all types of wet and dry particles, such as dust, smoke, aerosols, spray, asbestos, bacteria, viruses and mould. The filter fits into Sundstrm half and full face masks, as well as the SR700 particle PAPR. The filter can be attached to Sundstrm non