High-Density Crosslinked Polyethylene (XLPE)
High-density crosslinked polyethylene, or XLPE, is a thermoset resin that is specifically designed for critical applications like chemical storage.
During the XLPE manufacturing process, a catalyst (peroxide) is built into the resin, which creates a free radical. The free radical generates the crosslinking of the polymer chain, so the tank essentially becomes one giant molecule. The result is a resin that is specifically designed for critical chemical applications.
XLPE VS. Linear Polyethylene (HDPE)
- XLPE has 20 times the environmental stress crack resistance of HDPE.
- It has 10 times the molecular weight of HDPE.
- It has 5 times the impact and tensile strength of HDPE.
XLPE VS. Fiberglass-Reinforced Plastic (FRP)
- XLPE offers seamless construction for greater strength.
- With FRP, chemicals can wick into the fiber, compromising tank life.
- XLPE can have a lower cost of ownership, due to the low amount of required maintenance compared to FRP.
- FRP often requires special handling to avoid cracking.
XLPE VS. Carbon and Stainless Steel
- XLPE has seamless one-piece construction, which eliminates the potential for chemical attack points and bad welds.
- Unlike carbon and stainless steel, XLPE has very broad chemical resistance capabilities without the need for high-cost coatings.
- XLPE requires limited routine inspection per the latest online PPC Installation Guide .
- XLPE is a cost-effective solution to high-priced alloys.
Additional Resources:
- Video: XLPE vs. HDPE When Pressurized
- Blog: Differences and Similarities of HDPE and XLPE
- Blog: High-Density Cross-Linked Polyethylene Testing Standards Explained
Learn more about the benefits of high-density crosslinked polyethylene tanks over fiberglass reinforced plastic tanks in our guide.
