RIWISA AG was founded on 11th March 1946 by Martin Richner, Adolf Wirth and Joseph Sax as one of the first plastics’ processing firms in Switzerland. Initially the firm made a name for itself in the processing of buttons and toilet seats made from duroplastics and later in the manufacture of thermoplastics. From 1955 RIWISA AG produced polyaethylene, polyamide and multi-layer films as well as disposable packaging from 1957. In 1998 the production of medicinal items started under clean-room conditions.