BS EN ISO 02418:2017 pdf download

BS EN ISO 02418:2017 pdf download.Leather — Chemical, physical and mechanical and fastness tests — Sampling location
1 Scope
This document specifies the location of a laboratory sample within a piece of leather and the method of labelling and marking the laboratory samples for future identification.
It is applicable to all types of leather derived from mammals irrespective of the tanning used.
It is not applicable to leathers derived from birds, fish, reptiles or furs.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in the International Glossary of Leather Terms [1] apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Location of laboratory samples
4.1 General
4.1.1 Segmentation of leather
For the purposes of this document, the following segmentation of leather is considered (see Figure 1):bend (or butt), shoulder and belly.
4.1.2 Selection of samples
4.1.2.1 Areas selected for laboratory samples shall be free from all obvious defects such as scratches and flay cuts.
4.1.2.2 The sampling procedures described are designed to allow concurrent physical, colour fastness and chemical testing.
4.1.2.3 The results of analyses carried out on samples taken from different segments can vary
significantly. For this reason, added to the impossibility to uniquely define segments size, sampling from whole hides and sides is to be preferred (see 4.2).
4.1.3 Sampling for physical and colour fastness testing
4.1.3.1 For physical and colour fastness testing, take leather samples from the non-shaded areas specified in Figure 2 to Figure 5 as appropriate.
4.1.3.2 In arbitration analysis, only leather samples taken from the appropriate area of whole hides,
skin or sides (see 4.2) shall be used as the test sample.
4.1.4 Sampling for chemical testing
4.1.4.1 For chemical testing, take leather samples from the shaded area specified in Figure 2 to Figure 5 as appropriate.
4.1.4.2 If the minimum mass required for chemical testing is not attained, sample from the corresponding area on the other side of the backbone. If this is impossible, take additional material from the area immediately adjacent to the sampling position.
4.1.4.3 Uncontaminated trimmings from physical test pieces may be used for chemical testing except in arbitration analysis.
4.1.4.4 In arbitration analysis, only leather samples taken from the appropriate shaded area of whole hides, skin or sides (see 4.2) shall be used as the chemical test sample.
4.1.5 Sampling where areas of tension exist
If a hide is cut into half hides or segments and dried afterwards in a toggling drier or a drying process that creates tension in the leather at the edges, then the distance of the sampling areas from the edges of the leather shall be increased from 50 mm to at least 100 mm where possible.