What does the acronym PEX stand for in plumbing terminology?

The acronym PEX stands for Crosslinked Polyethylene, which is a type of plastic used extensively in plumbing systems. This material is known for its flexibility, resistance to scale and chlorine, low thermal conductivity, and ease of installation. Crosslinking the polyethylene gives it enhanced mechanical properties, making it suitable for both hot and cold water applications.

PEX pipes are advantageous because they can be snaked into walls, reducing the number of fittings needed and minimizing the potential points of leaks. Additionally, PEX does not corrode and is less likely to burst in freezing conditions compared to traditional piping materials. This versatility and durability have made PEX a popular choice in modern plumbing systems, especially in residential applications.