BS ISO 10195:2018 pdf download

BS ISO 10195:2018 pdf download

BS ISO 10195:2018 pdf download.Leather — Chemical determination of chromium(VI) content in leather — Thermal pre-ageing of leather and determination of hexavalent chromium
1 Scope
This document specifies a thermal pre-ageing procedure for leather to obtain indications about the tendency to the formation of hexavalent chromium under specified conditions and the determination of hexavalent chromium according to ISO 17075-1 or ISO 17075-2.
This thermal pre-ageing procedure does not simulate any real condition in leather production or use.
It is applicable to all types of chromium tanned leather.
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 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 4044:2017, Leather — Chemical tests — Preparation of chemical test samples
ISO 17075-1:2017, Leather — Chemical determination of chromium(VI) content in leather — Part 1:Colorimetric method
ISO 17075-2:2017, Leather — Chemical determination of chromium(VI) content in leather — Part 2:Chromatographic method
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Principle
A test specimen of leather is heated in an oven for a specified period of time. The sample is then cooled and the chemical determination of hexavalent chromium [chromium(VI)] is carried out according to ISO 17075-1 or ISO 17075-2.
5 Apparatus
5.1 Static oven, capable of maintaining the required temperature within a tolerance of ±2 °C. The oven shall not have a fan or any other air circulating system, nor openings that allow active air exchange. The oven should have an interior made of inert materials. An oven with natural convection should be used.
6.2 Cut a leather sample in accordance with ISO 2418. If sampling in accordance with ISO 2418 is not possible (e.g. leathers from articles like shoes, garments), details about sampling shall be given in the test report.
6.3 Prepare the leather test specimen according to ISO 4044:2017, 6.3. Cut it into pieces of 3 mm to 5 mm with a sharp blade.
6.4 Weigh accurately (2,0 ± 0,1) g of leather test specimen, to 0,1 mg accuracy, into the vessel (5.2).Record the mass, m.
6.5 The vessel shall be closed immediately after weighing.
6.6 Open the vessel and place it in the oven.
6.7 The oven door shall not be opened during the ageing time. The temperature and humidity shall be checked (5.3) at least three times during the ageing process.