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ISO 4326:1980

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

Mar 1, 1980

General information

90.93     Nov 1, 2024

ISO

ISO/TC 91

International Standard

71.100.40  

French   English  

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 4326:1980
90.93 Standard confirmed
Nov 1, 2024

National adoptions

SRPS ISO 4326:1992  
ISS

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

90.93   Standard confirmed

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