The process streams found in chlor-alkali and chlorate plants require unique materials of construction to provide corrosion resistance to these aggressive environments which typically operate in the temperature range of 80-100°C. The poly dicyclopentadiene has exceptional corrosion resistance and offers a cost effective alternative to premium metals, perfluorinated materials, and dual laminates currently used in these plants. This material also provides the temperature stability necessary to operate in these process streams. Included is a discussion on the corrosion resistance and physical properties retention of poly dicyclopentadiene in saturated chlorine gas, anolyte, sodium hydroxide, and potassium hydroxide. The cost advantages of poly dicyclopentadiene over alternative materials are also discussed. Keywords: dicyclopentadiene, chlor-alkali industry, chlorate industry, chlorine gas, chlorinated brine, caustic soda, potassium hydroxide, piping material, corrosion resistance, impact strength.