0

ISO 7327:1994

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

Publication date:   Jun 23, 1994

General information

90.93 Standard confirmed   Mar 4, 2020

ISO

ISO/TC 61/SC 12 Thermosetting materials

International Standard

83.080.10   Thermosetting materials

Buying

Published

Language in which you want to receive the document.

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
Mar 4, 2020