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ISO 4326:1980

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

NORMA vydaná dňa 1.3.1980

Anglicky -
Elektronické PDF (54.80 EUR)
Anglicky -
Tlačené (54.80 EUR)


Francúzsky -
Elektronické PDF (54.80 EUR)
Francúzsky -
Tlačené (54.80 EUR)

Informácie o norme:

Označenie normy: ISO 4326:1980
Dátum vydania normy: 1.3.1980
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO

Anotácia textu normy 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.