PVC is the most frequently specified of all industrial plastic piping materials. It has been used successfully for over 60 years. PVC is characterized by distinctive physical properties and is resistant to corrosion and chemical attack by acids, alkalies, salt solutions and many other chemicals. It is attacked, however, by polar solvents such as ketones and aromatics. Of the various types and grades of PVC used in plastic piping, SDR conforming to ASTM D1784, is the most common. The maximum service temperature for PVC is 140°F.