7616 International Standard OS1) INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAA OPrAHV3ALMR IO CTAHAAPTW3ALVW+ORGANISATION INTERNATIONALE DE NO RMALISATION Cellular plastics, rigid - Determination of compressive creep under specified load and temperature conditions Plastiques alveolaires rigides - Determination du fluage sous compression dans des conditions specifiees de charge et de température First edition - 1986-08-15 UDC 678.076 : 620.173.25 : 539.377 Ref. No. ISO 7616-1986 (E) Descriptors : plastics, cellular plastics, rigid plastics, tests, compression tests, creep tests, determination, creep properties. Price based on 2 pages Copyright International Organization for Standardization Not for Resale Foreword Iso (the Internationai 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 the right to be represented on that committee. Internationaf organizations, govern- mental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as tnternational Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at teast 75 % approval by the member bodies voting. International Standard ISO 7616 was prepared by Technical Committee ISO/TC 61, Plastics. It canceis and repiaces Technical Report ISO/TR 2799-1978, of which it constitutes a technical revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1986 . Printed in Switzerland ed without license from IHS Not for Resale ISO 7616-1986 (E) INTERNATIONAL STANDARD Cellular plastics, rigid - Determination of compressive creep under specified load and temperature conditions Scope and field of application 5 Test specimen 1 This International Standard specifies a method for the deter- 5.1 Specimens mination of compressive creep of rigid cellular plastics under specified load and temperature conditions. This method is for The test specimens shall be, as nearly as possible, rectangular use in measuring the creep resistance of materials to be used in parallelepipeds with a square base of 50 ± 1 mm. A thickness the thermal insulation of buildings (see IsO 4898). of 50 ± 1 mm is recommended, but it shall be not less than 20 mm. If the sample thickness is greater than 50 mm, the test specimen shall be a cube with all dimensions equal to the References not vary by more than 1 % (tolerance on parallelism). Iso 291, Plastics - Standard atmospheres for conditioning NOTE -- Test results on test specimens of different thickness may not and testing. be comparable. ISO 1923, Rigid cellular plastics and rubbers - Determination 5.2 Preparation of linear dimensions. Iso 4898, Rigid cellular plastics -- Specification for materials Specimens shall be cut from the sample so that the direction of used in the thermal insulation for buildings. test corresponds to the direction in which the compressive forces wil be applied in the intended use. If this direction is Iso 7850, Cellular plastics, rigid - Determination of com- unknown, then two sets of specimens shall be tested in the two pressive creep. principal directions of anisotropy. Specimens shail be prepared by cutting with either a mechanical saw or a knife. A jig shail be used to assure the rec- 3 Principle tangularity of the specimens and the parallelism of the faces. Determination of compressive creep under specified conditions Material skins that form an integral part of the product in use of load, temperature and time. shall be retained. 5.3 Number Apparatus At least three s