Foreword

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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.

This second edition cancels and replaces the first edition (ISO 21869:2006), which has been technically revised.

The main changes are as follows:

— a new Clause 6, Loss on ignition, and a new Clause 7, Magnesium oxide content, have been added;
— information on the determination of copper and manganese content have been moved to Annex B;
— a 75 µm sieve opening has been added as an alternative in 9.2;
— a new Clause 12, Ash of hydrochloric acid-insoluble matter, Clause 13, Water–soluble matter content and Clause 14, Bulk density have been added;
— a new Annex A, Determination of calcium oxide content, has been added;
— high, medium and low activity for α, β, and γ, respectively, have been specified in Annex B.

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.

BS ISO 21869:2022

Rubber compounding ingredients. Magnesium oxide. Methods of test

Current

Published:

31 Aug 2022