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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

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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.

SDO ISO: International Organization for Standardization
Document Number ISO 6796
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
Publish Date Document Id Type View
Not Available ISO 6796:1981 Revision