The Sundstrom SR100, which has P3 filters and is made from silicone with two exhalation valves to reduce resistance. Dust and paint mist can be kept away from the membrane by protective baffles on valve covers.The elastic head harness of the mask, formed as a V-shaped loop with an extensive crown plate guarantees good and firm fitting. Rigorously tested per EN 140:1998 it has a nominal protection factor of 50. The included P3 filters offer an impressive defense against a number of particulates.
https://www.protectivemasksdirect.co.uk/sundstrom-sr100-half-mask-p3-filter
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