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EN ISO 7327:1997

Current

Current

The latest, up-to-date edition.

Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride (ISO 7327:1994)

Published date

06-18-1997

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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

ISO 760:1978 Determination of water Karl Fischer method (General method)

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