These pleated, interchangable P3 filters (to fit onto SPR501 half mask) have a minimum efficiency of 99.95% at 0.3 microns and a breathing resistance of 3 mbar at a flow rate of 47.5 l/min for each filter.
Protects against dust that can cause lung desease. In particular, protects against coal, silica, cotton, iron ore, graphite, koalin, zinc and aluminium dusts. It also protects against harmful dusts such as asbestos, bauxite and toxic dusts such as manganese, lead and chromium.