Merflex® PEX OT® Oxygen Barrier Tubing
Our oxygen barrier tubing is designed to meet the rigorous demands of hydronic heating and radiant floor applications. Manufactured by Mercury Plastics, this high-performance tubing combines the proven benefits of cross-linked polyethylene (PEX) with a durable oxygen diffusion barrier to ensure long-term system integrity and corrosion prevention.
Engineered for Superior Performance
Merflex PEX OT Oxygen Barrier Tubing combines the proven durability of cross-linked polyethylene with a co-extruded EVOH oxygen barrier that protects closed-loop hydronic systems from corrosion. Designed for radiant and hydronic heating applications, it offers consistent performance, easy handling, and long-term reliability.
Durable & Reliable
- Meets ASTM F876 and F877 standards
- Complies with ASTM F2023 for chlorine resistance
- Oxygen barrier layer meets DIN 4726
- Rated for continuous service at 180°F at 100 psi
High-Quality Construction
- Cross-linked polyethylene for lasting strength
- Smooth inner surface minimizes pressure loss
- EVOH oxygen barrier permanently bonded through co-extrusion
- Excellent resistance to kinking and cracking
Easy to Handle & Install
- Flexible for tight routing and simple coil handling
- Maintains shape and stability under high temperatures
- Compatible with standard hydronic fittings
Safe & Compliant
- Manufactured from high-grade, FDA-compliant materials
- Certified to NSF-61 for drinking water system safety
- Meets all major ASTM and DIN performance standards
- Proven performance in both residential and commercial systems
Merflex PEX OT Oxygen Barrier Tubing Applications
Merflex Oxygen Barrier Tubing is ideal for closed-loop hydronic systems requiring corrosion prevention and long service life.
Common applications include:
Radiant floor heating systems
Baseboard heating loops
Hydronic panel heating
Snow and ice melt systems
Closed-loop boiler systems
Merflex PEX Listing
& Approvals
- NSF Standard 61: Drinking Water System Components – Health Effects
- NSF Standard 14: Drinking Water System Components – Performance
- Plastic Pipe Institute (PPI) Hydrostatic Stress Board, TR-4 Listing, Standard Grade @ 73° F (23° C) HDB 1250 psi, 180° F (82° C) HDB 800 psi and 200° F (93° C) HDB 630 psi.
- CSA Standard B137.5 – Cross-linked polyethylene (PEX) tubing for pressure applications
- PEX 5006 rating – The highest chlorine resistance rating possible
- ASTM F876 – Standard Specification for Crosslinked Polyethylene (PEX) Tubing
- ASTM F877 – Standard Specification for Crosslinked Polyethylene (PEX) Tubing – Hot and Cold Water Distribution Systems
Get Started with Mercury Plastics
Contact Mercury Plastics today for additional information or to receive a sample of the Merflex Oxygen Barrier Tubing.