The main difference between CPVC and PVC

The main difference between CPVC and PVC is the range of temperatures each is capable of withstanding. CPVC can handle temperatures up to 200° Fahrenheit, while PVC peaks at 140° Fahrenheit. Above those temperatures, both CPVC and PVC will begin to soften, increasing the risk of joints and pipes failing, and therefore, failing of the plumbing system.

The primers, solvent cements, and bonding agents are different for PVC and CPVC due to the differences in the material's chemical composition. For example, CPVC solvent cements must meet ASTM F493 specifications, and PVC solvent cements must meet ASTM D2564 specifications. Because of this, CPVC and PVC pipes and fittings, along with their solvents and bonding agents, should not be used interchangeably. In addition to meeting ASTM specifications, there are different solvent cements required based on the pipe’s size and intended application, so check the product containers to be sure you’re using the correct agent for the correct application.

PVC comes in nominal pipe sizes only, while CPVC is available in both nominal pipe sizes and copper tube sizes. CPVC has greater flexibility than PVC, and requires support at three foot intervals to maintain its position.

Characteristics and Properties

CPVC AND PVC VISUAL SIMILARITIES AND DIFFERENCES

PVC pipes are white or dark gray in color.

CPVC is off-white, light gray, or yellow in color.

Both pipe types have technical specifications printed on the side for easy verification.

Both pipe types are available in plain end and bell end.

Both come in Schedule 40 and Schedule 80 thickness.

Schedule 40 PVC also comes in Class 125 fittings.

PVC is available in 10 ft and 20 ft lengths.

CPVC is available in 10 ft and 20 ft lengths.

Certain diameters of PVC pipe and furniture PVC pipe are now available in 5 ft sections.

CPVC AND PVC PROPERTIES

Both resist corrosion and degradation from chemicals classified as an acid, alkali, or inorganic material.

PVC maximum functional temperature is 140° Fahrenheit.

CPVC maximum functional temperature is 200° Fahrenheit.

The extra chlorine in CPVC increases chemical strength and helps prevent bacteria / biofilm formation within the pipes.

Both are impact-resistant and durable.

Both are safe for use with potable water when ANSI / NSF 61 certified.

SPECIAL CONSIDERATIONS

When PVC or CPVC is heated, melted, or hot-cut, fumes that are toxic (dioxin and hydrochloride) are emitted.

When working with PVC or CPVC, work in a well-ventilated area with proper safety apparel, including gloves, goggles and a respirator if available.

For solvent welding, each material requires a primer and solvent cement (pipe glue) designed specifically to be used with PVC or CPVC. The type of solvent cement may vary based on the pipe's intended application.

PVC is less expensive than CPVC, and both materials are cheaper than copper, iron or stainless steel pipes.

PVC pipes are sized by the nominal pipe size (NPS) sizing standard (NPS references the pipe interior diameter).

CVPC pipes are sized by the nominal pipe size (NPS) and copper tube size (CTS) sizing standard (CTS references the pipe outside diameter).