Reference number
ISO 1389-4:1977
© ISO 2024
ISO 1389-4:1977
Phthalic anhydride for industrial use — Methods of test — Part 4: Measurement of colour after treatment with sulphuric acid
Edition 1
1977-02
Withdrawn
Withdrawn (Edition 1, 1977)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 1977-02
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 2
  • Technical Committee :
    ISO/TC 47
    ICS :
    71.080.50 
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