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SRPS ISO 4326:1992

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

Apr 7, 1992
Apr 7, 1992

General information

90.93     Nov 1, 2024

90.20    Oct 15, 2029

ISS

H091

International Standard

71.100.40  

Serbian  

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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
SRPS ISO 4326:1992
90.93 Standard confirmed
Nov 1, 2024

Related project

Adopted from ISO 4326:1980