PVC vs CPVC
You`re probably familiar with PVC pipe. It's the white plastic pipe commonly used for plumbing and drainage. PVC stands for polyvinyl chloride, and it`s become a common replacement for metal piping. PVC`s strength, durability, easy installation, and low cost have made it one of the most widely used plastics in the world. PVC is a thermoplastic material that is molded into different shapes to create pipes, fittings, valves and other liquid handling supplies.
Other Differences Between PVC & CPVC:
There are a few other differences between the two materials. Most North American PVC pipe uses a Nominal Pipe Size (NPS), while CPVC is available in either NPS standard sizing -OR- CTS (Copper Tube Size) sizing.
The copper tube sizing system is an entirely different sizing system from Nominal Pipe Size, and as the name implies it is the same system used for copper tube pipe.
Before purchasing CPVC be aware of what your use will be, and what sizing system you require. Color can be a clue, too. Often CTS CPVC is a light yellowish color, while schedule 80 CPVC (NPS) is a light gray color.
PVC pipe and fittings usually comes in white or dark gray. Always check the manufacturer printing on the pipe to be sure.
Because of the differences in chemical makeup, sometimes PVC or CPVC also require different primers and solvents for connecting pipe and fitting joints.
The creation of a strong joint depends on the cement`s ability to chemically soften the plastic. For this reason you should always use a cement specific to the material you are using.
(To be continued...)
