International Standard
ISO 6796:1981
Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method
Reference number
ISO 6796:1981
Edición 1
1981-09
International Standard
Vista previa
ISO 6796:1981
13294
No disponible en español
Publicado (Edición 1, 1981)
Esta norma se revisó y confirmó por última vez en 2019. Por lo tanto, esta versión es la actual.

ISO 6796:1981

ISO 6796:1981
13294
Idioma
Formato
CHF 42
Convertir Franco suizo (CHF) a tu moneda

Resumen

The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution. If the sample contains free acidity or alkalinity a corresponding correction is made. From the corrected hydroxyl number, the apparat relative molecular mass may be calculated by a formula given.

Informaciones generales

  •  : Publicado
     : 1981-09
    : Norma Internacional confirmada [90.93]
  •  : 1
     : 3
  • ISO/TC 47
    71.080.60 
  • RSS actualizaciones

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