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

Standard No.

ISO 1389-4:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 1389-4:1977

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.

ISO 1389-4:1977 history

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