Condensate resistance test of protective coating on the reverse side of Ruukki steel sheets has shown results that exceed the maximum requirements of the standards many times over.
Ruukki requirements for raw materials and production are set in such a way that products have to last as long and efficiently as possible. The coating resistance on the reverse side of the steel sheets of mineral wool panels to condensate is a significant characteristic that affects the durability of products in case of panel damage during exploitation. Possible causes of such damage include wetting of structures during the construction phase, inaccurate seams, leaks in the places where communications pass, etc.
Häme University of Applied Sciences (Finland) has carried out extensive tests on the resistance of the coating on the reverse side of panels steel sheets to condensate. The category of corrosion protection of the reverse sheet of panels, regulated by the standards DSTU EN 14509:2017 and DSTU EN 10169:2019, has to be at least CPI2 (500 hours test without changing the characteristics of the coating), and the highest category according to these standards is CPI5 (1,500 hours). Testing Ruukki sandwich panels for moisture resistance lasted for 9,600 hours and even after that the coating surface of the tested sample was in excellent condition. Thus, the coating quality of the steel sheets of Ruukki sandwich panels is 19 times higher than the minimum and 6 times the maximum requirements of the standards.
The highest corrosion protection is achieved due to the fact that the internal surface of Ruukki sandwich panels has a two-layer polymer coating of epoxy resin containing special anti-corrosion pigments, unlike most panels on the market with internal surface made of a single layer conventional polyester.