ISO INTERNATIONAL STANDARD 9853 First edition 1991-07-01 Injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings for pressure pipe systems - Crushing test Raccords moules en poly(chiorure de vinyle) non plastifié (PvC-U) pour canalisations avec pression -- Essai a I'écrasement Reference number ISO 9853:1991(E) Not for Resale d without license from IHS ISO 9853:1991(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- bodies casting a vote. International Standard IsO 9853 was prepared by Technical Committee IsO/Tc 138, Plastics pipes, fittings and valves for the transport of fluids. Annexes A and B of this International Standard are for information only. ISO1991 permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed inSwitzerland ii t license from IHS Not for Resale ISO 9853:1991(E) Introduction tnjection-moulded unplasticized poly(viny! chloride) fittings can be crushed without their failing if they contain no residual stresses as a result of the moulding process. However, if these residuai stresses are too great, the fitting will fail when a crushing force is applied. The percentage deformation of a fitting, in relation to its initial diameter, constitutes a simple criterion for the seiection of fittings having an ac- ceptable level of internal stresses ili No reproduct Not for Resale