NORMSERVIS s.r.o.

ISO 4327:1979

Non-ionic surface active agents — Polyalkoxylated derivatives — Determination of hydroxyl value — Phthalic anhydride method

NORMA vydána dne 1.12.1979

Anglicky -
Elektronické PDF (2064.40 CZK)
Anglicky -
Tištěné (2064.40 CZK)


Francouzsky -
Elektronické PDF (2064.40 CZK)
Francouzsky -
Tištěné (2064.40 CZK)

The information about the standard:

Designation standards: ISO 4327:1979
Publication date standards: 1.12.1979
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: International technical standard
Kategorie: Technické normy ISO

Annotation of standard text ISO 4327:1979 :

Description / Abstract: 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.