This International Standard specifies a method for determining the dry creep factor of glass-reinforced plastics pipes. It is applicable to pipes with an initial specific ring stiffness of not less than 630 N/m2, when determined by the method specified in the referring standard. NOTE — For this purpose plates or beam bars are considered to be equally valid for loading the test piece up to a relative deflection of 28 %. When it is expected that the relative deflection will be more than 28 %, then the test is to be conducted using beam bars (see 8.3).