ISO 527-3:2018 pdf free.Plastics一Determination of tensile properties一 Part 3: Test conditions for films and sheets.
5 Apparatus
See 150 527-1:2012, Clause 5, subject to the following additional requirements.
According to ISO 527-1:2012, 5.1.2, the tensile-testing machine shall be capable of maintaining the speeds of testing as specified in ISO 527-1:20 12, Table 1. It is normal for films and sheets to be tested at a speed of 5 mm/mm, 50 mm/mm, 100 mm/mm, 200 mm/mm, 300 mm/mm or 500 mm/mm. The information contained in ISO 527-1:20 12, 9.6, also applies.
According to ISO 527-1:2012, 5.1.5, when testing thin sheets or film material, the specimen shall not carry the weight of the extensometer.
According to ISO 527-1:2012, 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 specified in ISO 4591. When ISO 4591 is used, the average thickness of the film sample shall be taken as the thickness of the test specimen.
6 Test specimens
6.1 Shape and dimensions
6.1.1 The preferred form of test specimen for the determination of tensile properties by this method is a strip that is 10 mm to 25 mm wide and not less than 150 mm long (specimen type 2 — see Figure 1), 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, lB 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 (see Figure 2) 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 lB (see Figure 3) is recommended for rigid sheets.
6.2 Preparation of specimens
6.2.1 The test specimens described in 6.1.1 shall be cut or punched so that the edges are smooth and free from notches; examination with a low-power magnifier 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 magnifier to ensure the absence of notches. Discard any specimen with obvious imperfections on the cut edges.
6.3 Gauge marks
See ISO 527-1:20 12, 6.3.
The marking device used to produce the gauge marks shall have two parallel edges which are ground smooth and true, 0,05 mm to 0,10 mm wide at the edge and bevelled at an angle of not more than 15°. An ink stamp may also be used to apply ink to the area of the gauge marks, before or after producing them with the marking device, using an ink of a suitable contrasting colour that has no deleterious effect on the film being tested.
6.4 Checking the specimens
Discard any test specimen with obvious imperfections on the cut edges.
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