ISO 17130:2021 pdf download – Leather — Physical and mechanical tests — Determination of dimensional change.
7.3 Age the test pieces as described in ISO 17228:2015, Table 1, Table 2 or Table 3, by heat, by heat and elevated humidity, or under cyclic temperature or humidity conditions, respectively. 7.4 If required, immediately after ageing, at the end of a period of cyclic ageing or intermediately between periods of cyclic ageing, and within 5 min of removal of the test piece from the oven (5.1) or climate chamber (5.2), the distances between the measurement points may be measured according to 7.1. If further cyclic ageing is required, the test piece shall be returned to the climate chamber as quickly as possible. 7.5 When the ageing procedure is complete, remove the test piece from the climate chamber and from the glass plate or stainless-steel mesh and place on a flat and horizontal plane prior to reconditioning the test pieces for at least 24 h in accordance with ISO 2419. After this, measure the distances between the measurement points according to 7.1. NOTE The measurement values taken immediately after ageing can significantly differ from those taken after reconditioning in accordance with ISO 2419. 7.6 Note any visual changes of the test piece, such as distortion, and any changes in flexibility and softness manually. 8 Expression of results 8.1 The shrinkage may be expressed as linear shrinkage or loss of area (area shrinkage).
9 Test report The test report shall include the following: a) a reference to this document, i.e. ISO 17130:2021; b) full details for identification of the sample and any deviation from ISO 2418 with respect to sampling; c) the dimensions of the test pieces used; d) description of the support used (glass or stainless-steel mesh with or without polyester nonwoven fabric); e) the test conditions used for ageing; f) the timing of measurement if less than the 24 h reconditioning in 7.5; g) mean value of the percentage linear shrinkage, S L , as calculated in 8.2 or mean value of percentage loss in area, S A (area shrinkage), as calculated in 8.3 to the nearest 0,1 %; h) details of any visual changes or changes in flexibility and softness; i) the standard atmosphere used for conditioning and testing as given in ISO 2419; j) any deviations from the method specified in this document; k) the date of the test.