ICS 83.040.10;83.060                          PCD 29

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 4) (Third Revision) which is identical with ISO 8053 : 1995 ‘Rubber and latex — Determination of copper content — Photometric method’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Methods of Test for Rubber and Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council. Methods of test for various characteristics of natural rubber were originally published under four different parts of IS 3660, which were subsequently revised and published as thirteen separate parts termed as NR series for methods of test for natural rubber. Complete list of these standards showing correspondence of various test methods in the existing series of IS 3660, namely, their previous versions are given in National Annex A.

Method of test for determination of copper was originally covered under IS 3660 (Part I) : 1966 ‘Determination of dirt, volatile matter, ash, total copper, manganese, iron, rubber hydrocarbon, viscosity (shearing disc viscometer) and mixing and vulcanizing of rubber in a standard compound’. The method was based on photoelectric absorption technique. However, during that period most of the laboratories were not equipped with photoelectric absorptiometer. The difficulty was addressed during the first revision of the standard in 1972 by introduction of an additional test method, the Nessler’s method, termed as the routine method. Over a period of time, the use of photoelectric absorption techniques grew for determination of copper and other elements and the availability of the equipments also increased. Second revision of the Indian Standard was brought out in 1988 by drawing assistance from ISO 8053 : 1986 ‘Rubber and rubber latex — Determination of copper content — Photometric method’. In the second revision, only the photoelectric absorption method was retained.

This third revision of the standard has been undertaken to align with the latest version of ISO 8053 : 1995 under dual numbering system.

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’.

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.