Binders

Fourier Transform Infrared (FT-IR) spectroscopy

Using the infrared spectrophotometer, the infrared spectrum of a product’s binder can be determined. A small (paint) flake or a few drops of wet product are sufficient to obtain an accurate infrared spectrum with which the binder can be identified. The infrared spectrum is a graph that displays the absorption or transmission of radiation as a function of the irradiated energy or wavelength.

The term ‘fingerprint’ is often encountered as a characterization of a paint, and this frequently refers to the infrared spectrum. In other cases (such as in the standards ISO 20340, NORSOK M-501, EN 10290, Shell DEP 30.48.00.32, Enercon QS tow 30-6b, ISO 15741), the infrared spectrum forms part of the fingerprint (the chemical and physical characterization of the paint).

In troubleshooting, FT-IR is used as an important instrument for demonstrating or excluding a specific type of coating.