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Norm
ISO 7327:1994
Ausgabedatum: 1994 06 23
Plastics — Hardeners and accelerators for epoxide resins — Determination of free acid in acid anhydride
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 col...
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Herausgeber:
International Organization for Standardization
Format:
Digital | 3 Seiten
Sprache:
Englisch
ICS
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.