{"id":1682,"count":7,"description":"Plastic Piping Systems \u2013 Fiberglass Reinforced Thermosetting Plastic (GRP) Pipes \u2013 Test Methods for Determining Apparent Initial Circumferential Tensile Strength.\r\nISO 8521 specifies six test methods for the determination of the initial hoop strength of the tensile wall per unit length of glass fiber reinforced thermosetting plastic (GRP) pipes.\r\nNOTE Another commonly used term for \u00abcircumferential tensile strength\u00bb is \u00abcircumferential tensile strength\u00bb and the two expressions can be used interchangeably.\r\nThe burst test (method A) is suitable for all types and sizes of pipe. It is considered the reference method. However, all the methods of ISO 8521 have the same validity. If the correlation of any of the methods B to F can be established by means of a comparative test program, then that method can be considered as 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), the modified strip test (method D) and the restricted strip test (method E) are suitable for pipes with a nominal size of DN 500 and larger. The Notched Plate Test (Method F) is primarily designed for use with helically wound pipe of nominal size greater than DN 500 with a winding angle other than approximately 90\u00b0.","link":"https:\/\/techlabsystems.com\/eng\/iso\/7-8-9\/iso-8521\/","name":"ISO 8521","slug":"iso-8521","taxonomy":"iso","parent":1645,"meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso\/1682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso"}],"about":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/taxonomies\/iso"}],"up":[{"embeddable":true,"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso\/1645"}],"wp:post_type":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/product?iso=1682"},{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/normas?iso=1682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}