The standard also applies to synthetic aix Account is taken of the use of air at normal ambient pressures and increased pressures. Maximum allowable concentzations of impurity for compressed are quoted as values calculated at normal atmospheric pressure.This European Standard does not apply to compressed air used for medical purposes, for underwater breathing apparatus specially designed to be used for diving in water and other fluids when the hydrostatic pressure exceeds 6 bar absolute or for bread apparatus designed for use at high altitudes.
EN 12021:1998 history
2014EN 12021:2014 Respiratory equipment - Compressed gases for breathing apparatus
1998EN 12021:1998 Respiratory Protective Devices - Compressed Air for Breathing Apparatus