ISO 527-3:1995 pdf download – Plastics – Determination of tensile properties

03-01-2022 comment

ISO 527-3:1995 pdf download – Plastics – Determination of tensile properties
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 527. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 527 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
5 Apparatus
See ISO 527-1. clause 5. subject to the following ad- ditional requirements. In 5.1.2, the tensile-testing machine shall be capable of maintaining the speeds of testing as specified in table 1 of ISO 527-1. It is normal for films and sheets to be tested at a speed of 5 mm/min, 50 mm/min, 100 mm/min, 200 mm/min, 300 mm/min or 500 mm/min. The information contained in ISO 521-1, subclause 9.6, also applies.In 5.1.5. when testing thin sheets or film material, the specimen shall not carry the weight of the extensometer. In 5.2, devices complying with the requirements in ISO 4593 shall be used for measuring the thickness, except in the case of very thin film (less than 0,01 mm thick) or embossed film. In those cases. the thickness shall be determined by the method speci- fied in IsO 4591. When ISO 4591 is used, the average thickness of the filtm sample shall be taken as the thickness of the test specimen.
6.1.1 The preferred form of test specimen for the determination of tensile properties by this method is a strip IO mm to 25 mm wide and not less than 150 mm long (specimen type 2 – see figure I), having two parallel gauge marks, 50 mm apart, on the central portion of the specimen. Some film materials have a very high elongation at break which may result in them being outside the stretching capacity of the testing machine. In such cases, it is permissible to reduce the initial distance between the grips to 50 mm.
6.1.2 When required by the specification for the material under test or for routine quality-control tests, dumb-bell specimen types 5, 1 B and 4 of the shape and dimensions shown in figures 2, 3 and 4 may be used. These specimens are convenient to produce and permit rapid quality-control testing. Specimen type 5 (figure2) is recommended for film and sheet with a very high strain at break. Specimen type 4 is recommended for other types of flexible thermoplastic sheet. Specimen type 1 B (figure 3) is recommended for rigid sheets.
6.2.1 The test specimens described in 6. I .I shall be cut or punched so that the edges are smooth and free from notches; examination with a low-power magni- fier is recommended to check the absence of notches. Razor blades, suitable paper cutters, scalpels or other devices capable of cutting the specimens to the proper width and producing straight, clean, parallel edges with no visible imperfections shall be used. Punch dies shall be kept sharp by regular honing, and a suitable backing material shall be used with punch dies to ensure a clean-cut edge.
6.2.2 The test specimens described in 6.1.2 shall be obtained by the use of punch dies, using suitable backing material to ensure a clean-cut edge. Dies shall be kept sharp by regular honing, and the edges of the specimen shall be examined with a low-power mag- nifier to ensure the absence of notches. Discard any specimen with obvious imperfections on the cut edges.

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