Gas filter Zelinsky Group UNIX 521 A1B1E1.
All UNIX filters match the full-face and half face UNIX masks
Organic gases and vapors, the boiling point of which is above 65 °C
(benzene, xylene, toluene, petrol, kerosene, organic halides, nitro-compounds of benzene and its homologues, aniline, ketones, tetraethyl lead, etc.)
Nonorganic gases and vapors
(chlorine, fluorine, bromine, sulfur hydride, arsines, hydrogen phosphide, etc., except for carbon monoxide and hydrogen cyanide)
Acid gases and vapors
(sulfur dioxide, hydrogen chloride, hydrogen bromide, hydrogen fluoride, vapors of sulfuric, acetic, formic, nitric, phosphoric acids, etc.)