60.60 Standard published Jun 18, 1997
CEN
CEN/TC 249 Plastics
European Norm
83.080.10 Thermosetting materials
Published
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.
PUBLISHED
EN ISO 7327:1997
60.60
Standard published
Jun 18, 1997
