Phthalic anhydride for industrial use; Methods of test; Part IV : Measurement of colour after treatment with sulphuric acid

ISO 1389-4:1977 — Phthalic anhydride for industrial use; Methods of test; Part IV : Measurement of colour after treatment with sulphuric acid is an international standard developed by International Organization for Standardization (ISO). 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...

This standard covers: 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.

This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.

The current published version is ISO 1389-4:1977, published on 1977-02. Always check for amendments or pending revisions.

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