Since its foundation STONE has been a combination of curiosity, ambition, inventiveness and strong adaptable teamwork. Together with our specialists and partners we have been developing coatings for the present and the future for more than 20 years from the idea to the suitable product solution.
Individual consultation and product development
Quality analysis and testing methods of the STONE Laboratory
Weathering tests serve as a tool for improving product quality. Outdoor weathering is used to determine the resistance of coatings to external environmental influences.
according to DIN EN ISO 16474-1 / 3
This test method is used to examine the weather resistance of surfaces. In a special weathering chamber, samples are exposed to UV light, humidity and temperature and the changes in the surface are examined at regular intervals.
Cross Cut Test
In the cross cut test, two multiple cuts are made at a 90° angle to each other on a coating using a cross cutting device. This targeted damage to the surface allows conclusions to be drawn about the adhesion to the substrate.
The abrasion resistance of a coating is investigated with the help of rotating rubber rollers. This standardized method makes it possible to compare the abrasion resistance of different coatings with each other or with each other.
Double Rub Test
The “double rub test” is used to examine paint surfaces for solvent resistance. It is also used to test the cross-linking of UV coatings. In this test, a special felt is impregnated with e.g. methyl ethyl ketone (MEK) and rubbed in double strokes over the sample to be tested at a defined test force. The test duration depends on the occurrence of a visible change in the coating surface or the agreed number of double strokes.