Reference number
ISO 7327:1994
© ISO 2024
International Standard
ISO 7327:1994
Plastics — Hardeners and accelerators for epoxide resins — Determination of free acid in acid anhydride
Edition 1
1994-07
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Published (Edition 1, 1994)
This publication was last reviewed and confirmed in 2020. Therefore this version remains current.

ISO 7327:1994

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Format
CHF 42
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Abstract

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
     : 1994-07
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 3
  • Technical Committee :
    ISO/TC 61/SC 12
    ICS :
    83.080.10 
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