This anti-gas and anti-particles filter is equipped with a standard threaded connection conforming to EN 148-1 and can be used on full face masks with the same connection. It protects from organic and inorganic acid gases and vapours sulphur dioxide ammonia and its derivatives. Classified as a class 2 filter for gases and class 3 for particles it can be used to protect against harmful substances solvents toxic particles and micro-organisms.