ISO-4327 › Non-ionic surface active agents -- Polyalkoxylated derivatives -- Determination of hydroxyl value -- Phthalic anhydride method

ISO-4327 - 1ST EDITION - CURRENT


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 1ST EDITION - Dec. 15, 1979
 1ST EDITION ERRATUM - May 15, 1980

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.

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Document Number

ISO 4327:1979

Revision Level

1ST EDITION

Status

Current

Publication Date

Dec. 15, 1979

Committee Number

ISO TC 91