The two primary types of PEX (cross-linked polyethylene) pipe are classified by their manufacturing method, which determines their flexibility, durability, and suitability for different applications:
1. PEX-A (Engel Method)
Production: Cross-linked using peroxide (PEX-A) during extrusion (hot cross-linking).
Key Features:
• Most flexible (can be un-kinked with heat).
• Highest degree of cross-linking (≥85%), offering superior burst strength.
• Memory effect: Returns to original shape when heated.
Best For:
• Cold climates (resists freezing damage).
• Tight bends without fittings.
• Radiant floor heating systems.
2. PEX-B (Silane Method)
Production: Cross-linked via silane gas (PEX-B) after extrusion (moisture cure).
Key Features:
More rigid than PEX-A (requires elbows for sharp bends).
Slightly lower cross-linking (65–70%).
Cost-effective (most common in North America).
Best For:
• Residential plumbing.
• Standard hot/cold water supply.
• Projects requiring budget-friendly options.
Comparison Summary
| Feature | PEX-A | PEX-B |
| Flexibility | Excellent | Moderate |
| Burst Strength | Higher (500+ PSI) | Slightly lower (400+ PSI) |
| Price | More expensive | Affordable |
| Installation | Expands for fittings | Requires crimp/clamp |
Note: A third type, PEX-C (electron beam cross-linking), exists but is less common due to lower flexibility and higher brittleness.
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