Materials for production plants must be corrosion resistant and mechanically stable. Additionally, the plant hygiene and product hygiene may represent key aspects, depending on the product. Typical materials for the equipment in the chemical, pharmaceutical and food industries are high-quality stainless steels as well as special metals, super alloys, non-metals and plastics. To avoid contaminations, the stainless steel equipment is polished on the product contact surfaces. Chemical resistant special materials are used as massive material or often applied on a steel base.