Codes & Standards - Purchase
ISO 7327:1994
Plastics -- Hardeners and accelerators for epoxide resins -- Determination of free acid in acid anhydride
SKU: iso_014003_105921
Published by ISO
Publication Year 1994
1 Edition
3 pages
Product Details
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.