ÖNORM EN 1120

This standard specifies a method for determining the chemical resistance properties of glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger. In conjunction with EN 705 this standard provides a method for evaluating the effect of a chemical environment on the interior of a pipe or fitting after a specified period of time. NOTE I: It has been found that the effect of chemical environments can be accelerated using strain induced by deflection, hence it is frequently referred to as strain corrosion. NOTE 2: To study the applicability of the method to testing the pipe or fitting with regard to structural failure (where structural failure becomes apparent by a sudden reduction in the load applied of at least 20 t of the initial load) then where "weep failure" is referred to in this standard substitute "structural failure". A structural failure can be caused by conditions such as: interlaminar separation; cracks in or through the structural layer of the wall; - tensile failure of the glass reinforcement; - if applicable, separation of a thermoplastics liner from the structural wall. For such studies, data from "structural failure" results will be analyzed separately from "weep failure" results.