Conforms to EN 143.

For use in concentrations of organic vapours, inorganic and acid gases upto 10x Workplace Exposure Limit (WEL) or 1000 ppm whichever is the lower when fitted to a 3M half mask or up to 20x WEL or 1000 ppm whichever is the lower when fitted to a 3M full face mask.

Standards
EN 143:2000 + A1:2006