ISO 6796:1981 (R2019)
Withdrawn , Reaffirmed Standard
Most Recent

ISO 6796:1981 (R2019)

Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method

Summary

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.

Notes

90.60 : Clôture de l'examen

Technical characteristics

Publisher International Organization for Standardization (ISO)
Publication Date 09/01/1981
Confirmation Date 07/19/2019
Edition 1
Page Count 3
EAN ---
ISBN ---
Weight (in grams) ---
No products.

Previous versions

Contact us