EN ISO 7327:1997
Current
The latest, up-to-date edition.
Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride (ISO 7327:1994)
18-06-1997
Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Procedure
7 Expression of results
8 Test report
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.
| Committee |
CEN/TC 249
|
| DocumentType |
Standard
|
| PublisherName |
Comite Europeen de Normalisation
|
| Status |
Current
|
| Standards | Relationship |
| NS EN ISO 7327 : 1ED 1997 | Identical |
| DIN EN ISO 7327:1997-11 | Identical |
| BS EN ISO 7327:1997 | Identical |
| ISO 7327:1994 | Identical |
| PN EN ISO 7327 : 2002 | Identical |
| NEN EN ISO 7327 : 1997 | Identical |
| NBN EN ISO 7327 : 1997 | Identical |
| NF EN ISO 7327 : 1997 | Identical |
| I.S. EN ISO 7327:1998 | Identical |
| UNE-EN ISO 7327:1998 | Identical |
| ISO 760:1978 | Determination of water — Karl Fischer method (General method) |