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ISO 20873:2018 pdf free

ISO 20873:2018 pdf free.Footwear一Test methods for outsoles一Dimensional stability
This document specifies a method for determining the linear shrinkage after heating of test specimens prepared from outsoles.
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 17709, Footwear一Sampling location, preparation and duration of conditioning of samples and test pieces
ISO 18454, Footwear一Standard atmospheres for conditioning and testing of footwear and components for footwear
ISO 23529, Rubber一General procedures for preparing and conditioning test pieces for physical test methods
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
一ISO Online browsing platform: available at https://www.iso.org/obp
一IEC Electropedia: available at http://www.electropedia.org/
reduction in the distance between two reference points on a test piece before and after heating in air under specified conditions
Note 1 to entry: This shrinkage is expressed as percentage of the initial distance.
Using a scalpel or other sharp knife (4.2) and a steel rule (4.1), cut the test specimens to the dimensions and tolerances given in Figure 1
Make two parallel reference cuts on the external surface not more than 0,5 mm deep across the full width of the test specimen on each side of it, 100 mm±5 mm apart for the larger test specimen and 50 mm±5 mm apart for the smaller test specimen.
Remove the test specimen from the oven at the end of the period of heat treatment. Keep the test specimens for at least 30 min in a standard atmosphere. If the test specimens are bowed, hold them flat for measurement.
If the measuring cuts have widened, take the point of the measurement as the centre of the cut.Measure to within ±0,2 mm the distance between these cuts along the centreline as described, using an appropriate device.ISO 20873 pdf free download.

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