This International Standard specifies three test methods for determining the longitudinal tensile properties of pipes of glass-reinforced thermosetting plastics (GRP). The properties which can be determined are:
— the longitudinal tensile strength
— the percentage ultimate elongation
— the longitudinal modulus of elasticity.
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 C uses a notched plate cut from a pipe wall section.
Method A is applicable to pipes with a nominal size of DN 50 or greater with circumferentially wound filaments, with or without chopped glass and/or woven rovings and/or fillers, and to centrifugally cast pipes. It is applicable to those 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 and including DN 150.
Method C is primarily intended for use for helically wound pipes with a winding angle other than approximately 90° This method may also be used for other types of pipe.
Results from one method are not necessarily equal to the results derived from any of the alternative methods. How-ever, all methods have equal validity.
ISO 8513:2000 history
2023ISO 8513:2023 Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength
2016ISO 8513:2016 Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Test methods for the determination of the initial longitudinal tensile strength
2014ISO 8513:2014 Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Test methods for the determination of the apparent initial longitudinal tensile strength
2000ISO 8513:2000 Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Determination of longitudinal tensile properties