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Homepage>ISO Standards>ISO 6796:1981-Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method
download between 0-24 hoursReleased: 1981
ISO 6796:1981-Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method

ISO 6796:1981

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

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Standard´s number:ISO 6796:1981
Pages:3
Edition:1
Released:1981
DESCRIPTION

ISO 6796:1981


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.
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