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 does not require ongoing maintenance and inspection.
• XLPE is a cost-effective solution to high-priced alloys.

Additional Resources:

• Video: XLPE vs. HDPE When Pressurized
• Video: Impact Strength of XLPE
• Blog: High-Density Cross-Linked Polyethylene Testing Standards Explained
• Blog: XLPE - Not Just a Marketing Ploy
• Blog: The Role of Chemical Temperatures in XLPE Chemical Storage

Learn more about the benefits of high-density crosslinked polyethylene tanks over fiberglass reinforced plastic tanks in our guide.