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)
06-18-1997
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 |
UNI EN ISO 7327 : 2000 | Identical |
SN EN ISO 7327 : 1998 | Identical |
BS EN ISO 7327:1997 | Identical |
UNE-EN ISO 7327:1998 | 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 |
ISO 760:1978 | Determination of water Karl Fischer method (General method) |
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