EN 140

Respiratory protective devices are protective devices intended to protect against hazardous substances in the aeriform state such as particles, vapours and gases by means of the filtering mechanism. These devices, which partially or completely cover the face, are made of filtering material or consist of a reusable structure fitted with replaceable filters. Each class features specific filters.
The EN 140 standard specifies the reusable half-face devices, that therefore only cover mouth, nose and chin and are equipped with exhalation valve. One or more replaceable filters intended to capture contaminants in the air are inserted on the half-face mask. The structure is made of elastic material to guarantee proper tightness of the face.