He then moved to Scheuerfeld where he acquired the Berger paper mill and began the "Deutsche Duroleum Gesellschaft", making fiberboard plates again.
This activity was later incorporated into the company Thermopal after Krages sold his holdings due to his stock market speculation in the 1960s.
A special surface made with Electronic Beam Curing (EBC), a coating technique developed by Trespa, ensures durability and scratch resistance.
Because the surface of Trespa Plate has a dense molecular coating, it is virtually impervious to weather (temperature, UV radiation and humidity).
Because of these advantages, the material has been popular since the 1980s in the production of laboratory surfaces and outdoor signage, but also for shower stalls and toilet cubicles in educational, hospital, and campground facilities.