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ISO 4326:1980

Non-ionic surface active agents — Polyethoxylated derivatives — Determination of hydroxyl value — Acetic anhydride method

NORM herausgegeben am 1.3.1980

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The information about the standard:

Designation standards: ISO 4326:1980
Publication date standards: 1.3.1980
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: International technical standard
Kategorie: Technische Normen ISO

Annotation of standard text ISO 4326:1980 :

Description / Abstract: The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.