Steel-door works at Jonschwil, part of the Elkuch group since 2000, manufacturing largely bespoke steel doorsets and frames for industrial and infrastructure buildings on 10,000 m² of production space. It holds 18 live VKF recognitions across Brandschutztüren (10), glazed fire doorsets (6), a fire shutter and a glazing approval, and combines fire resistance with burglary, flood and acoustic performance in the same doorset.