IS 6191 : Part 4 : 2024/ISO 11640 : 2018 Methods of Micro-Biological, Colour Fastness and Microscopical Tests for Leather - Part 4 Colour Fastness to Cycles of toand-fro Rubbing
NATIONAL FOREWORD
This Indian Standard (First Revision) (Part 4) which is identical to ISO 11640 : 2018 'Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing' 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.
This standard was first published in 2018 as an identical adoption of ISO 11640 : 2012 under dual numbering. This Part specifies a method for determining the behavior of the surface of a leather on rubbing with a wool felt.
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 5 Test for adhesion of finish
Part 6 Colour fastness to perspiration
The first revision of this standard has been brought out in order to align it with the latest version of ISO 11640 : 2018. In this revision following modifications have been done:
a) Clause 3 is added; and
b) Clause 5.2, 7.2, 7.4, 8.2, 8.6, and 8.7 have been revised.
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.