ISO 7327:1994
Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride
- Standard No.
- ISO 7327:1994
- Release Date
- 1994
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 7327:1994
- 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.
ISO 7327:1994 history
- 1994 ISO 7327:1994 Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride
