International Standard
ISO 4326:1980
Non-ionic surface active agents — Polyethoxylated derivatives — Determination of hydroxyl value — Acetic anhydride method
Reference number
ISO 4326:1980
Edición 1
1980-03
International Standard
Vista previa
ISO 4326:1980
10199
No disponible en español
Publicado (Edición 1, 1980)
Esta norma se revisó y confirmó por última vez en 2019. Por lo tanto, esta versión es la actual.

ISO 4326:1980

ISO 4326:1980
10199
Idioma
Formato
CHF 42
Convertir Franco suizo (CHF) a tu moneda

Resumen

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.

Informaciones generales

  •  : Publicado
     : 1980-03
    : Norma Internacional en proceso de revisión sistemática [90.20]
  •  : 1
     : 3
  • ISO/TC 91
    71.100.40 
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