Foreword

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This document was prepared by Technical Committee ISO/TC 132, Ferroalloys.

This second edition cancels and replaces the first edition (ISO 7692:1983), which has been technically revised.

The main changes are as follows:

— in 5.5 (previously in 4.6), hydrofluoric acid has been replaced with fluoboric acid;
— in 5.13 (previously in 4.17), the concentration of titanium standard solution has been changed;
— in 5.13.1 (previously in 4.17.1), the amount of titanium(IV) dioxide has been reduced and the decomposition of titanium(IV) dioxide has been changed;
— in 5.13.2 (previously in 4.17.2), potassium hexafluorotitanate has been replaced with a titanium sponge and the preparation has been changed;
— in Clause 6 (previously in Clause 5), polytetrafluoroethylene (PTFE) beakers have been replaced with a conical flask;
— in Clause 7 (previously in Clause 6), the mesh size of the sieve has been changed;
— the paragraph of the definition of test portion has been changed in 8.1 and the amount of test portion in 8.1 (previously 7.1) has been reduced from 1,0 g to 0,50 g;
— in 8.2.1, (previously in 7.4.1), the method using titanium sponge has been removed;
— in 8.3.1 (previously 7.5.1), the amount of acids has been reduced;
— in 8.3.4 (previously 7.5.3.2), the amount of the aluminium has been reduced from 4,0 g to 3,0 g ± 0,2 g;
— in Clause 9 (previously in Clause 8), the expression of results has been changed;
— in Clause 10, the precision has been added;
— in Clause 11 (previously in Clause 9), the test report has been changed;
— Annex A has been added;
— Annex B has been added;
— Annex C has been added.

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 7692:2025

Ferrotitanium. Determination of titanium content. Titrimetric method

Current

Published:

27 Jan 2025

1 Scope