Our quality system exceeds by far the demanded national and European test standards and is based on experiences over many decades in the production of slate for roof and façade.
Out of it originated a test system for the assessment of world-wide slate qualities. Only the best slate deposits comply with our strict specifications.With test methods developed by ourselves as well as by constant on-site control of our own production processes we take care of the compliance with the quality criteria.
At the same time we are additionally supported by independent test institutions. You can here download the relevant test certificates. .