This International Standard describes a method for the accelerated conditioning of test specimens of polyamides and copolyamides. It is applicable to grades containing more than 2 % (m/m) extractables. The equilibrium moisture content attained by this method is close to the equilibrium moisture content obtained in standard atmosphere 23/50. The values of mechanical properties obtained after accelerated conditioning in accordance with this method may differ slightly from those obtained after conditioning in standard atmosphere 23/50.