ISO 37:2017 pdf download – Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties

02-26-2022 comment

ISO 37:2017 pdf download – Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties
7.1 Dies and cutters
All dies and cutters used shall be in accordance with ISO 23529. Dies for preparation of dumb-bells shall have the dimensions given in Table 2 and Figure 3 except for the cutting edge for which Figure 3 only indicates a suitable geometry. The departure from parallelism at any point along the width of the narrow portion of the die shall nowhere exceed 0,05 mm. For a method of cutting type B ring test pieces, see Annex A.
7.2 Thickness gauge
The instrument for measuring the thickness of dumb-bell test pieces and the axial thickness of ring test pieces shall be in accordance with that used in method A of ISO 23529:2016. The instrument for measuring the radial width of ring test pieces shall be similar to the above, except that the contact and base plate shall be shaped to fit the curvature of the ring.
7.3 Cone gauge
A calibrated cone gauge or other suitable equipment shall be used to measure the internal diameter of ring test pieces. The equipment shall be capable of measuring the diameter with an error of not more than 0,01 mm. The means of supporting the ring test piece to be measured shall be such as to avoid any significant change in the dimension being measured.
7.4.1 The tensile-testing machine shall comply with the requirements of ISO 5893, having an accuracy of force measurement complying with class 1. An extensometer, where used, shall have an accuracy complying with class D for type 1, 1A and 2 dumb-bell test pieces and class E for type 3 and 4 dumb-bell test pieces. The machine shall, as a minimum, be capable of operating at rates of traverse of 100 mm/min, 200 mm/min and 500 mm/min. When testing dumb-bells, the method of measuring the extension might require the test machine to apply a small prestress to the test piece to avoid it bending. In this case, the machine shall be capable of applying the necessary prestress.
7.4.2 For tests at temperatures other than a standard laboratory temperature, a suitable thermostatically controlled chamber shall be fitted to the tensile-testing machine. Guidance for achieving elevated or subnormal temperatures is given in ISO 23529.
10.3 Conditioning of samples
Condition all samples, other than those from latex, in accordance with ISO 23529 at a standard laboratory temperature, without humidity control, for not less than 3 h prior to cutting out the test pieces. Condition all prepared latex samples in accordance with ISO 23529 at a standard laboratory temperature, with humidity control, for not less than 96 h prior to cutting out the test pieces.
10.4 Conditioning of test pieces
Condition all test pieces in accordance with ISO 23529. If the preparation of test pieces involves buffing, the interval between buffing and testing shall be not less than 16 h and not greater than 72 h. For tests at a standard laboratory temperature, test pieces that do not require further preparation may be tested immediately, if cut from conditioned test samples. Where additional preparation is involved, a minimum conditioning period of 3 h at standard laboratory temperature shall be allowed. For tests at temperatures other than a standard laboratory temperature, condition the test pieces at the temperature at which the test is to be conducted for a period sufficient to enable the test pieces to attain substantial equilibrium in accordance with ISO 23529 (see also 7.4.2).

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