scope:

This International Standard establishes guidelines for the construction and use of enclosures with volumes less than 200 dm ³⁾, in order to obtain atmospheres of constant relative humidity at given temperatures , using saturated aqueous salt solutions, glycerol/water solutions or sulfuric acid/water solutions, for conditioning and testing plastics. It specifies the procedures to be followed to maintain the relative humidities of the conditioning and testing atmospheres within the required tolerances, at the temperatures specified by particular International Standards. Information is given concerning the methods of producing desired humidities in these enclosures at temperatures from 5 ° C to 60 ° C. The relative humidity values indicated are average values, in per cent, with permissible deviations of ± 2