Reference number
ISO 6796:1981
International Standard
ISO 6796:1981
Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method
Edition 1
1981-09
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ISO 6796:1981
13294
Published (Edition 1, 1981)
This publication was last reviewed and confirmed in 2019. Therefore this version remains current.

ISO 6796:1981

ISO 6796:1981
13294
Language
Format
CHF 42
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Abstract

The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution. If the sample contains free acidity or alkalinity a corresponding correction is made. From the corrected hydroxyl number, the apparat relative molecular mass may be calculated by a formula given.

General information

  •  : Published
     : 1981-09
    : International Standard under systematic review [90.20]
  •  : 1
     : 3
  • ISO/TC 47
    71.080.60 
  • RSS updates

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