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ISO 6796:1981

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

Publication date:   Sep 1, 1981

General information

90.93 Standard confirmed   Jul 19, 2019

ISO

ISO/TC 47 Chemistry

International Standard

71.080.60   Alcohols. Ethers

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Scope

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.

Life cycle

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PUBLISHED
ISO 6796:1981
90.93 Standard confirmed
Jul 19, 2019