ISO 6796:1981
Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method
UNE 55717:1984
SURFACE ACTIVE AGENTS. POLYGLYCOLS. DETERMINATION OF HYDROXYL NUMBER. PHTHALIC ANHYDRIDE ESTERIFICATION METHOD
ASTM E222-23
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
ASTM E222-17
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
ASTM E222-10
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
ASTM E222-00(2005)e1
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
ASTM E222-00
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation