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With more than 40 years of proven performance and over 15 billion feet of PEX pipe installed worldwide, Uponor is the most tested and third-party listed PEX system in the industry, making it the professional’s choice for commercial piping systems.

And now with our newest offering of PEX pipe and ProPEX® fittings in 2½" and 3" sizes, you can specify and install an Uponor PEX piping system in even more commercial plumbing and hydronic piping applications.

Uponor Commercial Plumbing and Hydronic Piping Systems

Hear why Uponor PEX pipe and ProPEX® fittings are changing the way professionals install commercial plumbing and hydronic piping systems.

Webinar: Best Practices for Installing PEX in Commercial Plumbing Applications

Learn about best practices for installing PEX pipe and ASTM F1960 expansion fittings in commercial installations. Topics will include proper pipe handling, fire-resistive construction, controlling expansion and contraction forces, direct burial and suspended piping applications


What is PEX?
What is the difference between PEX-a, PEX-b and PEX-c?
What are the temperature and pressure ratings for Uponor PEX?
What are the Uponor PEX manufacturing standards?
What are the Uponor PEX listings?
What are the Uponor PEX codes?
What is the UV resistance of Uponor PEX?
Is Uponor PEX chlorine resistant?
Is Uponor PEX safe?
Why is PEX better than copper?

PEX is an acronym for crosslinked polyethylene. It is a flexible, durable, corrosion-resistant product that possesses distinctive properties that make it ideal for plumbing systems. There are three different types of PEX piping: PEX-a, PEX-b and PEX-c. Uponor manufactures PEX-a piping, which is considered the superior type of PEX in the industry.

All three PEX manufacturing processes generate piping that is crosslinked to varying degrees and are acceptable for potable-water, hydronic distribution and radiant heating and cooling applications.

• PEX-a is manufactured using the Engel or peroxide method
• PEX-b is manufactured using the Silane method
• PEX-c is manufactured using the E-beam (electron beam) or radiation method

Uponor manufactures PEX-a piping. The PEX piping industry considers PEX-a superior because the crosslinking is done during the manufacturing process when polyethylene is in its amorphic state (above the crystalline melting point). Because of this, the degree of crosslinking reaches around 85% (higher than PEX-b or PEX-c), resulting in a more uniform, more flexible product with no weak links in the molecular chain.
Uponor PEX carries the following hydrostatic temperature and pressure ratings.

• 200°F (93.3°C) at 80 psi
• 180°F (82.2°C) at 100 psi
• 120°F (48.9°C) at 130 psi (½" piping only)
• 73.4°F (23°C) at 160 psi

In accordance with ASTM F876 Standard Specification for Cross-linked Polyethylene (PEX) Piping, the excessive temperature and pressure capability for Uponor AquaPEX® is 210°F (99°C) at 150 psi.

Click Here to learn the standards that Uponor PEX is manufactured to.

Click here to learn about the listings that Uponor PEX conforms to.
Click here for a listing of all codes that Uponor PEX meets.

The test method for evaluating UV resistance as required by ASTM F876 is ASTM F2657 Test Method for Outdoor Weathering Exposure of Cross-linked Polyethylene (PEX). According to ASTM F876, PEX piping must bear a four-digit code to signify the requirements it meets. The second digit in the code references the minimum ultraviolet (UV) resistance of the piping. For example, piping with a 5106 marking has a “1” as the second digit, which indicates the piping meets minimum UV resistance requirements for a period of 1 month. Piping with a “2” as the second digit indicates a resistance period of 3 months. Uponor AquaPEX White and Wirsbo hePEX piping carry a 5106 marking, indicating a UV-resistance period of 1 month. Uponor AquaPEX Red and Blue piping (typically used for plumbing applications) carry a 5206 marking, indicating a UV-resistance period of 3 months.

ASTM F876, the Standard Specification for Crosslinked Polyethylene (PEX) Piping, was revised in August 2008 to include a voluntary oxidative resistance (i.e., chlorine resistance) rating that indicates suitability for use in continuous-recirculation systems where piping is exposed to hot, chlorinated water 100 percent of the time. Uponor AquaPEX® piping for potable-water applications is certified by NSF International to meet the latest ASTM F876 oxidative-resistance requirements for continuous recirculation, as indicated by the PEX 5106 designation on white piping and PEX 5206 on red and blue piping.

Uponor AquaPEX® piping for potable (drinking) water is held to the highest testing, codes, listings and standards in the plumbing industry. In addition to testing and certification at NSF International, Canadian Standards Association (CSA) and Underwriters Laboratories (UL), Uponor PEX piping has been tested and approved for potable-water applications by the most demanding agencies in the world, including DVWG-Germany, KIWA-Netherlands, CTSB-France and BSI-Great Britain. Toxicity extraction testing performed in accordance with ANSI/NSF 61 “Drinking Water System Components – Health Effects” verifies Uponor PEX piping does not leach potentially harmful substances into the drinking water.

Uponor PEX piping has several benefits over copper pipe. Because of its flexibility, Uponor PEX can bend with each change in direction. This means fewer connections are required, which, in turn, means fewer potential leak points. This flexibility also enables it to expand up to three times the piping’s diameter, which means it is more resistant to damage from frozen water in the system.

Uponor PEX also has greater thermal characteristics over copper which means it retains more heat in hot-water lines and resists condensation on cold-water lines better than copper. Additionally, because copper is a metal, it is vulnerable to pinhole leaks in areas with harsh water. This is not a concern with PEX, which is corrosion resistant.

PEX is also safer than copper. A study done by Rochester Medical Center published in Proceedings of the National Academy of Sciences reported a connection between copper and Alzheimer’s disease.

And lastly, PEX is very quiet. There is no issue with water hammer or singing pipes which is typical with metal plumbing systems.