NATIONAL FOREWORD

This Indian Standard (Part 11/Sec 9) (First Revision) which is identical with ISO 1628-1 : 2009 ‘Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 1: General principles’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Methods of Sampling and Test for Plastics Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 2004 which was identical with ISO 1628-1 : 1998. The first revision of this standard has been undertaken to align it with the latest version of ISO 1628-1 : 2009 and its Amendment No. 1 published in 2012. The major changes in this revision are as follows:

a) In 9.1, paragraph 4 (starting: “The intrinsic viscosity shall be calculated from”), where, in line 2, “intrinsic-viscosity values” has been replaced by “inherent-viscosity” values.

b) Amendment No. 1 to ISO 1628-1 : 2009 has been incorporated.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and 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.