Perforated metal sheets punched in mild steel, galvanised, stainless steel and special alloys. Stainless Steel perforated metals are used extensively in the engineering, food processing, building, agricultural, nuclear power and petrochemical industries and many others. Perforated materials are used in a number of different applications for a variety of reasons. Used mostly as screens, filters, shields, and guards, perforated materials can control the passage of air, liquid, light, solids, heat, electromagnetic waves, and sound waves.