Abstract Preview

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.


General information

  • Status :  Published
    Publication date : 1994-06
  • Edition : 1
    Number of pages : 3
  • :
    ISO/TC 61/SC 12
    Thermosetting materials
  • 83.080.10
    Thermosetting materials

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