NEN-EN-ISO 7327
Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride
active, Most Current
| Organization: | NEN |
| Publication Date: | 1 July 1997 |
| Status: | active |
| Page Count: | 12 |
| ICS Code (Thermosetting materials): | 83.080.10 |
scope:
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.
Document History
NEN-EN-ISO 7327
July 1, 1997
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,...