IS 6191 : Part 8 : 2025/ISO 17228 : 2015 Methods of Micro-Biological, Colour Fastness and Microscopical Tests for Leather - Part 8 Change in Colour with Accelerated Ageing
NATIONAL FOREWORD
This Indian Standard (Part 8) which is identical to ISO 17228 : 2015 'Leather - Tests for colour fastness - Change in colour with accelerated ageing' issued by the International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on the recommendation of the Leather, Tanning Materials and Allied Products Sectional Committee and approval of the Chemical Division Council.
IS 6191 : 1971 'Methods of micro-biological, colour fastness and microscopical tests for leather' prescribes various microbiological test methods, colour fastness test methods and test methods for the preparation of microscopical slides for assessment of leather, hides and skins. The Committee responsible for formulating this standard has decided to harmonize the methods of test prescribed in IS 6191 with those prescribed in ISO/IULTCS standards. Accordingly, the Committee decided to retain IS 6191 and publish the harmonized/adopted test methods published by ISO/IULTCS in various parts of IS 6191 as this standard is widely recognized by the Indian Leather Industry.
The Committee responsible for formulation of this standard decided to publish the latest version of ISO 17228 'Leather - Tests for colour fastness - Change in colour with accelerated ageing' as Part 8 of IS 6191 which is the standard series for 'Methods of micro-biological, colour fastness and microscopical tests for leather'.
This part specifies various ageing procedures to obtain an indication of the changes that could occur when leather is exposed to a certain environment for a prolonged time. Over time, the surface colour of leather and the leather itself change due to ageing and to the action of the surroundings on the leather. The test conditions to be used depend on the type of leather and its intended use.
This Indian Standard is published in several parts. The other parts in this series are:
Part 1 Colour fastness to water spotting
Part 2 Colour fastness to water
Part 3 Colour fastness to machine washing
Part 4 Colour Fastness to cycles of to-and-fro rubbing
Part 5 Test for adhesion of finish
Part 6 Colour fastness to perspiration
Part 7 Colour fastness to migration into polymeric material.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.