P2 is a respiratory filter rating under the AS/NZS1716 standards for use in Australia and New Zealand. It protects against mechanically and thermally generated particles. The P2 rating filters at least 94% of airborne particles. Suitable for relatively small particles generated by mechanical processes eg. grinding, cutting, sanding, drilling, sawing. Sub-micron thermally generated particles e.g. welding fumes, fertilizer and bushfire smoke.