Thermoplastics pipes for the conveyance of fluids. Determination of the stress-rupture resistance of moulding materials using plain strain grooved tensile (PSGT) specimens1 Scope This International Standard specifies a method for the determination of the time to failure of thermoplastics resins and compounds for piping and fitting applications by the use of a plane strain grooved tensile specimen in a stress rupture test. The grooved tensile specimen produces a biaxial state of stress on uni axial loading, which is taken to be indicative of the stress conditions found in pressurized solid wall plastics pipes. The ratio

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