ISO 6796:1981

Status : Published (Under review)

This standard was last reviewed and confirmed in 2019. Therefore this version remains current.

	Format	Language
std 1 40	PDF
std 2 40	Paper

CHF40

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Abstract

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.

General information

Status
: Published

Publication date
: 1981-09

Stage
: International Standard confirmed [90.93]
Edition
: 1

Number of pages
: 3
Technical Committee :
ISO/TC 47

ICS :
71.080.60
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