Water flows silently through PEX, eliminating the “water hammer” noise associated with metal piping.PEX expands, making it more resistant to freeze-cracking.Installing PEX does not require soldering.
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When repetitive stress is put on the fittings, a hole or notch can develop and can eventually progress to a crack or fracture. It is believed that some PEX tubing may be failing due to the amount of stress placed on the brass fittings connecting the tubes. It has been alleged that these fittings contain a higher-than-normal level of zinc, which, when they come in contact with water, can fail earlier than expected due to a process known as “dezincification.” This can cause a range of problems, including leaks and flooding. PEX pipes are made of plastic tubing that is connected by brass fittings. PEX-AL-PEX (Kitec/IPEX): dezincification of fittings.PEX-C (Nibco/CPI/DuraPEX): cracked, leaking pipes.PEX-B (Zurn & Viega): dezincification of fittings.PEX-A (Uponor/Wirsbo and Rehau): dezincification of fittings and chemical leaching/odor (AquaPEX only).Partial List of Manufactures with Problems PEX pipe remains popular for radiant floor heating.
The new plastic, fashioned into flexible PEX pipe (also known as PEX tubing), arrived in the US in the 1980s, initially for radiant floor heating systems: The flexible tubing is embedded in a concrete slab and hot water pumped through to heat the slab and radiate heat to rest of the room. In 1968, German scientist Thomas Engle discovered a way to crosslink common plastic (polyethylene) through radiation to produce a much suppler form of the material. Pex compression fitting failure is caused by dezincification that results in corrosion which will create leaks. Pex piping can leach toxic chemicals from pipe material. PEX pipe is also vulnerable when it contacts petroleum products or oxygen. Pex Piping fails when the pipes are exposed to chlorine that is common in municipal water supplies, exposure to direct sunlight before its installation. Pex failures are linked to piping and fitting. PEX plumbing system has been used for years and its failures has been well documented. Today, PEX is used in more than 60 percent of new construction residential water supply systems. Manufactures improved their fittings which solved that problem and the popularity of PEX surged. Complaints about early PEX water systems started when the fittings used to connect the pipes failed causing leaks.
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