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This Table was developed by Tomas Lenman He assisted in developing the Engel PEX-a process in the early 70's, authored ASTM F 876/877 1982-84, CSA 137.5 in 1989, founded Wirsbo Company in 1984, was Uponor Technical Director 1992-94, gaining extensive experience in all PEX processes.

ThermaPEX vs. Traditional PEX Below is a table that shows why ThermaPEX is a better product than traditional PEX. ThermaPEX compares favorably to PEX-a, PEX-b, & PEX-c. It is easier to work with, stronger, and has the best thermal memory and kink resistance available today.

Considerably more flexible than any other PEX tubing meeting ASTM Somewhat better flexibility than Radiation and Silane crosslinked tubing. Stiffer to work with Meets ASTM and Withstands higher inside pressures than other PEX Tubing Meets ASTM Meets ASTM Excellent Not very good. Worse than Radiation & Silane Good Excellent Good. Better than Radiation & Silane. Strength decreases after heated up to transparency. Excellent Excellent See above Excellent Fair. Better than Radiation and Silane More vulnerable to be kinked Meets DIN 4726 (Measured 25 times better) Meets DIN 4726 Meets DIN 4726 Excellent Better than ASTM requirements PEX-c: Better than ASTM requirements. PEX-b: Silane cross-links are reversible Excellent Fair PEX-c: x-link gradients PEX-b: Manufacturer dependent Little. Easy to bend in any direction. Fair. Better than Radiation and Silane. Tougher to straighten out. Narrower than any other PEX tubing Fair. Better than Radiation and Silane Largest Excellent Excellent PEX-c: Fatigue cracks can develop PEX-b: Unknown ~0.930 - the lowest ~0.938 - much more ~0.941 - highest Melted Melted Not Melted Small and even Fair Larger and more un-even Over 70% Over 70% Typically below 70% (but approved for that in ASTM)