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 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.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO 7327 |
| Publication Date | July 1, 1994 |
| Language | en - English |
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| Committee | ISO TC 61/SC 12/WG 5 |
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