![]() Studies have shown that if the zinc levels of brass are too high (generally above 30%), dezincification can occur, during which zinc leaches from the brass and creates a powdery buildup. While PEX is generally considered a safe product and accepted by building codes, the materials and components that comprise the system have several vulnerabilities, and several defective fittings and systems produced by various manufacturers have resulted in leaks and system failures.ĭuring the manufacture of brass pipe fittings used to connect separate sections of PEX piping, zinc is added to the copper alloy to increase the strength of the brass. PEX piping was invented in the 1950s and refined during the 1960s for use in for radiant floor heating systems. PEX piping is flexible, thereby able to change directions and bend around corners without the need for the elbow fittings required for rigid piping. The installation of PEX piping is typically faster, easier, and less expensive than rigid piping such as copper or PVC. ![]() During the past two decades in the United States, PEX has also become a common alternative to copper, polyvinyl chloride (PVC), and chlorinated polyvinyl chloride (CPVC) for use as potable (drinkable) cold and hot water system piping. Cross-Linked Polyethylene (PEX or XLPE) is a flexible plastic (polymer) tubing pipe primarily used in both hot and cold-water distribution plumbing systems.
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