Photometric analysis of components

The formaldehyde content of an interior paint can be determined down to a trace level of 0.1 ppm. Formaldehyde is first separated by means of steam distillation. A colour complex is then formed with formaldehyde. The concentration of formaldehyde is determined using a photometer that measures colour intensity. This method is used for example to check that coatings designed for allergic humans are formaldehyde free.

Microscopic examination of coating films

If after processing of a material, damage occurs to a coating, or it is not clear what material was processed, analytics can do some detective work to resolve the incidence of damage or determine the nature of the material. This procedure uses optical microscopy and infrared spectroscopy.

Microscopy enables statements to be used regarding coating thickness in the µm range and the number of layers applied. Our microscope magnifies by up to 200. A special lighting unit and various image processing tools mean we can increase the contrast ratio and thus make surface structures visible.

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Infrared spectroscopy analysis of paint materials and paint films

With infrared spectroscopy, the infrared ray penetrates a few micrometres into the surface of the paint and is reflected back. This triggers vibrations in the material and some of the rays are absorbed. This delivers characteristic infrared spectra and it can be derived what binding agents were used in a paint. RMI has a large database of FTIR reference spectra for paints and raw materials.

Please note that when we are testing whether a coating material complies with a reference material, the latter must be provided as a sample.

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