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ISO 6796:1981

Polyglycols for industrial use -- Determination of hydroxyl number -- Phthalic anhydride esterification method
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ISO 6796:1981

Polyglycols for industrial use -- Determination of hydroxyl number -- Phthalic anhydride esterification method

PUBLISH DATE 1981
ISO 6796:1981

The hydroxy groups present in a test portion are esterified with *phthalic anhydride*.

The excess phthalic anhydride 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 *apparent relative molecular mass* may be calculated by a formula given.

SDO ISO: International Organization for Standardization
Document Number ISO 6796
Publication Date Sept. 1, 1981
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
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