Foreword

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 1183-1:2019), which has been technically revised.

The main changes are as follows.

— In Clause 4, the temperature specifications of the immersion liquid and air have been added.
— In 5.1, an alternate version of the immersion method has been introduced which does not need a wire to suspend the specimen.
— In 5.1, the technical requirements for the pycnometer, the thermometer and the immersion liquids have been revised.
— In 5.1, the (classic) procedure using a wire to suspend the specimen has been clarified.
— In 5.1.4, the formulae for the calculation of the density have been revised to include the buoyancy in air.
— Clause 6 has been deleted, the buoyancy correction has been moved to 5.1.4.4 and the calculation of the density of air has been moved to Annex B.
— Annex B (changed from informative to normative) has been shortened to cover the calculation of air only. The method of correction for buoyancy of air has been revised and is now included in Formulae (3) and (4) in 5.1.4.4.
— Annex C has been added to present formulae for the determination of the volume of specimens measured by the immersion method.
— Annex D has been added to explain the updated formulae in 5.1 and Annex C.
— Precision data has been added in Annex E.

A list of all parts in the ISO 1183 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

ISO 1183-1:2025

Plastics. Methods for determining the density of non-cellular plastics — - Part 1: Immersion method, liquid pycnometer method and titration method

Current

Published:

19 Jun 2025