BS EN ISO 20873:2016 pdf download – Footwear — Test methods for outsoles — Dimensional stability This international standard specifies a method for determining the linear shrinkage after heating of test specimens prepared from outsoles. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 18454 Footwear – Standard atmospheres for conditioning and testing of footwear and components for footwear. ISO 17709 Footwear — Sampling location, preparation and duration of conditioning of samples and test pieces. ISO 4648 Rubber, vulcanized or thermoplastic – Determination of dimensions of test pieces and products for test purposes. 3 Definitions For the purposes of this International Standard, the following definition applies: 3.1 dimensional stability the reduction in the distance between two reference points on a test piece before and after heating in air under specified conditions. This shrinkage is expressed as percentage of the initial distance 4 Apparatus and material The following apparatus and material shall be used: 4.2 Templates and scalpel or other sharp knife, to cut two reference marks in the test specimen either 100 mm or 50 mm apart. 4.3 Oven, for heating the test specimens to 70 °C ± 2 °C and thermostatically controlled so that they are kept within 2C of the required temperature during the heating period. 4.4 Device capable of measuring the distance between two cuts, 50 mm apart or 100 mm apart, on a flat surface, to an accuracy of ± 0,2 mm. This may consist of either: a) a steel rule, marked in millimetres as in 4.1, together with a x5 magnifying glass; or b) a travelling microscope or similar optical device with scale. 4.5 Thickness gauge Thickness gauge, standing on a firm base and loaded with a dead weight such that the presser foot applies a pressure of 10 kPa ± 3 kPa. The gauge has a presser foot which is flat, circular and 10 mm ± 0,1 mm in diameter,as defined in ISO...

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