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ISO
ISO 7327:1994

ISO 7327:1994

Plastics — Hardeners and accelerators for epoxide resins — Determination of free acid in acid anhydride

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General Information

Status : Active

Standard Type : Main

Document No : ISO 7327:1994

Document Year : 1994

Pages : 3

Edition : 1

Section Volume : Thermosetting materials (ISO/TC 61/SC 12.)

ICS : Thermosetting materials (83.080.10)

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.