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ISO 1389-4:1977

Phthalic anhydride for industrial use — Methods of test — Part 4: Measurement of colour after treatment with sulphuric acid ISO 1389-4:1977

Publication date:   Feb 1, 1977

95.99 Withdrawal of Standard   May 27, 2002

General information

95.99 Withdrawal of Standard   May 27, 2002

ISO

ISO/TC 47 Chemistry

International Standard

71.080.50   Anhydrides

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Scope

The test sample is treated with sulphuric acid solution in a conical flask in boiling water bath for 3 h. The colour is measured by the method specified in ISO 2211. The results are expressed in Hazen units. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.

Life cycle

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WITHDRAWN
ISO 1389-4:1977
95.99 Withdrawal of Standard
May 27, 2002