Plastics — Small enclosures for conditioning and testing using aqueous solutions to maintain relative humidity at constant value

Establishes guidelines for construction and use of enclosures with volumes less than 200 cubicdecimetre in order to obtain atmospheres of constant relative humidity at given temperatures. It specifies the procedures to be followed to maintain the relative humidities of conditioning and testing atmospheres using saturated aqueous salt solutions, glycerol/water solutions or sulfuric acid/water solutions. The guidelines described do not apply to enclosures requiring frequent opening.