IS 15090 : Part 1 to 11 : 2002 : Raw Silk - Grading and Methods of Tests - Parts 1 to 11

(Superseding IS 2938 : 1992, IS 2941 : 1991, IS 2942 : 1991, IS 2943 : 1991, IS 2944 : 1991, IS 2945 : 1991, IS 2946 : 1991 and IS 2947 : 1991)

Reaffirmed 2019

FOREWORD

This Indian Standard (Parts 1 to 11) was adopted by the Bureau of Indian Standards, after the draft finalized by the Silk and Silk Products Sectional Committee had been approved by the Textile Division Council. The standards on grading and methods of test for raw silk originally published in 1964 were revised in 1991 to ensure that the standards are able to encompass comparative large proportion of production to have a meaningful effect.

The standards have been revised again and are being published as parts 1 to 11 of a new standard taking into consideration the strengths and weakness of Indian Silk Industry and present level of quality of raw silk. In this standard the top end of the existing grades has been maintained as such for comparison at par with the standards of International Silk Association, while slightly extending the cut off point from B to E at the bottom end so as to provide a means of differentiating among the substandard lots. It is expected that this will form the starting point for any strategic improvement to be brought forth in the raw silk quality as a result of implementation of the standard. The lot size and sample size for testing of raw silk has been revised based on detailed study of raw silk lots transacted in India conducted by CSTRI, Bangalore. Accordingly the values in respect of maximum deviation for various grades are different than those specified in International Silk Association Standards.

The Committee while finalizing the standard decided that all standards relating to grading and methods of test for raw silk be published as parts in one volume. Accordingly this standard on Raw Silk — Grading and Methods of Tests consists of parts detailed below:

Part 1 Grading

Part 2 Visual and tactual examination

Part 3 Determination of conditioned mass

Part 4 Conducting winding test

Part 5 Determination of size (count) deviation and maximum deviation

Part 6 Determination of conditioned size (count)

Part 7 Determination of evenness variation

Part 8 Determination of cleanness

Part 9 Determination of neatness and low neatness

Part 10 Determination of tenacity and elongation by serigraph test

Part 11 Determination of cohesion

Accordingly, various parts of this standards supersede the earlier standards on the subject as indicated on first page of each part.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounding off in accordance with IS 2:1960 Rules for rounding off numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.