The Moldex 5000 Series Disposable Half Masks have integral gas filters, making the mask disposable and exempt from the maintenance requirements of COSHH if disposed of within one month. When particulate filters get clogged they can be replaced for prolonged use of the mask. ABEK1 protection against organic [boiling point >65°C] + inorganic gases & vapours, acid gases and ammonia. Plus P3 protection against harmful and toxic dusts, fumes and aerosols based on water and oil. 10 x Workplace exposure limit (half mask)or 1000 ppm whichever is lower.