BS EN ISO 3303-1:2020 pdf – Rubber- or plastics-coated fabrics — Determination of bursting strength Part 1: Steel-ball method.
1 Scope This document specifies a method for the determination of the bursting strength of rubber or plastics coated fabrics, using a mechanically operated steel ball. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing ISO 7500-1:2018, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system 3? Terms? and? definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Principle A test piece is securely clamped between rigid coaxial apertures. A polished steel ball traversing at a fixed speed is pressed against the test piece until failure occurs. The force required to cause failure and the displacement of the polished steel ball at failure are recorded.
5 Apparatus and reagents 5.1 Testing machine, power driven, equipped with an electronic force measurement system and an electronic crosshead displacement monitor. The drive system shall be capable of maintaining constant the speed of the moving head to ±10 % of the set value. The force measurement system shall be capable of measuring the relevant forces occurring during the test within class 2 of ISO 7500-1:2018. The crosshead displacement monitor shall be capable of measuring the relevant displacements under load to within ±1,0 mm.
7 Preparation of test pieces 7.1 Take five test pieces across the usable width of the sample (see NOTE), at least 1 mm from the extremity of the sample, and of sufficient size so that each test piece can be clamped firmly in the clamping system of the test machine. The smaller dimension of each test piece shall be at least 12 mm greater than the outside diameter of the clamping surfaces. Alternatively, the sample may be tested at the requisite location across its width, avoiding areas that have already been used for a test by at least 20 mm. NOTE The usable width is defined in ISO 2286-1 as that width, excluding the selvedge, which is consistent in its properties, uniformly finished, and free of unacceptable flaws. 7.2 The face of the coated fabric to be tested shall be defined and agreed between the interested parties. The results might not be the same if the opposite face is tested. 7.3 When it is required to determine the properties of wet material, immerse the test pieces for 24 h in water (5.4), or water containing no more than 0,1 % wetting agent or surfactant (5.5), of about 20 times the total volume of the test pieces at the room temperature. Immediately after removal from the water, rinse the test pieces thoroughly in water and proceed to test within 1 min. 8 Time-interval between manufacture and testing 8.1 For all test purposes, the minimum time between manufacture and testing shall be 16 h. 8.2 For non-product tests, the maximum time between manufacture and testing shall be four weeks and, for evaluations intended to be comparable, the tests, as far as possible, shall be carried out after the same time-interval. 8.3 For products, whenever possible, the time between manufacture and testing shall not exceed three months. In other cases, tests shall be made within two months of the date of receipt by the customer.