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ISO 4327:1979

Current Revision

Non-ionic surface active agents -- Polyalkoxylated derivatives -- Determination of hydroxyl value -- Phthalic anhydride method

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The hydroxyl groups are esterified by phthalic anhydride in pyridine solution. The excess of phthalic anhydride is hydrolyzed with water containing in the sodium hydroxide solution used for the neutralization. The acidity which appears during the esterification and of the phthalic acid formed during the hydrolysis is neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volumes of sodium hydroxide solution used for the titration of the blank and of the test solution.


SDO ISO: International Organization for Standardization
Document Number ISO 4327
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 91
Publish Date Document Id Type View
Not Available ISO 4327:1979 Revision