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ISO 7327:1994

Plastics — Hardeners and accelerators for epoxide resins — Determination of free acid in acid anhydride

Jun 23, 1994

General information

90.93     Jun 30, 2025

ISO

ISO/TC 61/SC 12

International Standard

83.080.10  

French   English  

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Published

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Scope

The principle of the method specified is reacting a small amount of free acid present in a test portion of acid anhydride hardener or accelerator with rhodamine 6G to colour the test solution pink, measuring the absorbance of the coloured solution at a wavelength of about 510 nm using a spectrometer, determining the free-acid content from a calibration curve. The method is suitable for most anhydrides except for polyester and oligomeric anhydrides which may give too wide a scatter of results.

Life cycle

NOW

PUBLISHED
ISO 7327:1994
90.93 Standard confirmed
Jun 30, 2025

National adoptions

SRPS EN ISO 7327:2012  
ISS

Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride (ISO 7327:1994)

60.60   Standard published

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