ISO 8521:1998, Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipes -- Determination of the apparent initial circumferential tensile strength

This standard specifies six test methods for the determination of the apparent initial tensile strength in the circumferential direction per unit length of glass-reinforced thermosetting plastics (GRP) pipes.The burst test (method A) is suitable for all types and sizes of pipes. It is the reference method.The split disc test (method B) may not be suitable for pipes with helically wound reinforcing layers.The strip test (method C) and the modified strip test (method D) are suitable for pipes with a nominal size of DN 500 and greater.The restrained strip test (method E) is suitable for all types of pipes with a nominal size greater than DN 500.The notched plate test (method F) is primarily intended for use for helically wound pipes of nominal size greater than DN 500 with a winding angle other than approximately 90�.Results from one method are not necessarily equal to the results derived from any of the alternative methods. This title may contain less than 24 pages of technical content.