Објављен
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.
ОБЈАВЉЕН
ISO 7327:1994
90.93
Одлука о потврђивању стандарда
30. 6. 2025.
Plastične mase — Sredstva za otvrdnjavanje i ubrzivači za epoksidne smole — Određivanje slobodne kiseline u anhidridu kiseline
60.60 Стандард објављен