Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength ((ISO 8513:2016))
This International Standard specifies two test methods for determining the longitudinal tensileproperties of glass-reinforced thermosetting plastics (GRP) pipes. The properties which can bedetermined are— the longitudinal tensile strength, and— the percentage ultimate elongation.Method A uses, for the test piece(s), a longitudinal strip cut from a pipe.Method B uses a specified length of the full cross-section of the pipe.Method A is applicable to pipes with a nominal size of DN 50 or greater with circumferentially woundfilaments, with or without chopped glass and/or woven rovings and/or fillers, and to centrifugally castpipes. It is applicable to pipes with helically wound filaments with a nominal size of DN 200 or greater.Method B is applicable to all types of GRP pipe. It is usually used for pipes with a nominal size up to andincluding DN 150.Results from one method are not necessarily equal to the results derived from any of the alternativemethods. However, all methods have equal validity.Annex A describes additional considerations for method B that have been found useful for the testing ofthin-walled helically wound pipes and can be used to supplement the basic text.NOTE This International Standard does not address the determination of longitudinal tensile modulus.Due to the multi-layer construction of many GRP pipes, the accurate measurement of strain, necessary formodulus determination, can be very difficult. If it is desired to determine longitudinal modulus, see ISO 527-4and/or ISO 527-5.