Vitrex 331305 A1 Replacement Filters are used to protect lungs against organic vapours and gases with a boiling point above 65°C. A1 filters offer protection when spraying timber treatments, in areas of toxic dust, toxic fumes and toxic mists, and are suitable for most DIY spraying applications. Organic Vapour (examples): Alcohols, Benzene, Carbon, Tetrachloride, Glutaraldehyde, Methyl Ethyl Ketone (MEK), Octane, Phenol, Propanol, Styrene, Trichloroethane, Trichloromethane,Tetrachloroethylene, and Toluene. Suitable for use with the Twin Filter Respirator 331300. Supplied as a pack of 2. Conform to EN14387:2004 A1 standards.