ISO 1389-4:1977
$11.05
Phthalic anhydride for industrial use — Methods of test — Part 4: Measurement of colour after treatment with sulphuric acid
| Published By | Publication Date | Number of Pages |
| ISO | 1977-02 | 4 |
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.
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