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Corzan® CPVC pipe and fittings are backed by more than 50 years of proven performance in various applications, with distinct advantages over polypropylene (PP-R).

Since its arrival, PP-R system failures are reported in diverse climates and regions due to poor installation, as well as damaged pipes caused by chlorine disinfectants used in potable water. These inadequacies have left some homeowners, plumbers, and traders wondering which is the better material.

If you’re considering CPVC for your plumbing system, here are five areas where Corzan CPVC outperforms PP-R.

Strong, Rigid Material

Tensile Strength

CPVC is a highly durable material. When directly comparing Corzan CPVC to PP-R, our material has:

  • 60% greater tensile strength.
  • Nearly twice the flexural strength.
  • A higher pressure bearing capability, which allows CPVC to have the same flow rate as PP-R, but with a smaller pipe size.

Quicker, Cost-Effective Installation

Biofilm Formation Potential Chart

Solvent cement welding is the recommended joining method for Corzan CPVC because it’s quick, simple, and highly reliable.

  • The solvent welding process allows for quick and easy assembly.
  • Unlike heat welding, if mistakes during installation occur, they can easily be corrected by removing the fitting, cleaning residual solvent cement from the pipe, and starting the installation process over again.
  • The tools required are inexpensive and easy to use.
  • Solvent cemented joints are the strongest part of the piping system.
  • No heat is required for CPVC installation, so there is no fire or burn risk.
  • Solvent cement allows for easy installation in tight, confined spaces.
  • PP-R requires heat fusion to install. This leads to the likelihood of bead formation inside the pipe, which reduces flow rate and increases mineral deposits and bacterial growth.

CPS_Screen Shot 2018-10-05 at 1.50.33 PM_EN-PK

Superior Water Quality

Corzan CPVC’s resistance to biofilm formation helps keep water pure by reducing the risk of:

  • Accumulation of microorganisms which may cause health problems.
  • Impaired water quality, including taste and smell.
  • Bacterial growth, including multiplication of Legionella and Pseudomonas as well as increased counts of Coliform bacteria.

Multiple international studies confirm that CPVC consistently outperforms PP-R, when it comes to resisting biofilm formation.

Corzan CPVC has been approved for potable water applications by major international agencies including:

In fact, Corzan CPVC holds an NSF 61 Annex G certification, which verifies the weighted average lead content within the piping material is less than 0.25%.

Greater Material Safety

Limiting Oxygen Index (LOI) is the percentage of oxygen needed in the atmosphere to support combustion. The higher the value, the greater resistance to burning.

  • CPVC has an LOI of 60 and does not support combustion.
  • PP-R has an LOI of 18, making it a combustible material that can increase fire damage when flaming drips fall from the pipe.


Chlorine Resistant 

Depending on the material of your piping, common household disinfectants, like chlorine and chlorine dioxide, can damage pipes.

  • PP-R erodes in hot chlorinated water systems and is susceptible to oxidative stress cracking, causing pieces of the pipe to flake off and clog plumbing systems. Overtime, the system will lose its ability to hold pressure, resulting in leaks and sometimes system failure.
  • Corzan CPVC is unaffected by chlorine and chlorine dioxide present in potable water supplies thanks to the additives used to keep your water clean and safe.

Chlorine Resistance

***PP-R tested in general accordance with NSF P-171 Protocol for Chlorine Resistance of Plastic Piping Materials and ASTM F-2023-04 Test Method for Evaluating the Oxidative Resistance of PEX Tubing and Systems to Hot Chlorinated Water.

Corzan® CPVC vs. PP-R Installation

Corzan® CPVC solvent welding is a quicker and safer installation method versus PP-R which requires more tools. Watch the processes side-by-side and learn the differences.

Watch the Video

Overhead Installation - Corzan® CPVC vs. PP-R

Have you had to do pipe installation over your head? Watch to compare Corzan® CPVC installation vs PP-R. Corzan CPVC can be installed quicker, requires less labor to be completed and is safer.

Watch the Video

Ready to Get Started?

Contact us for a free process suitability and technical consultation. We want to make sure you get the localized support and information you need to take your project from blueprint to completion.

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