PEX-A vs. PEX-B
PEX-A and PEX-B are the two most common types of cross-linked polyethylene (PEX) piping, but they differ significantly in production methods, flexibility, performance, and cost. Here's a detailed comparison:
| Type | Cross-Linking Method | Cross-Linking Degree |
| PEX-A | Peroxide (Engel) Method | ≥70% (Highest) |
| PEX-B | Silane (Moisture-Cure) Method | 65-70% |
PEX-A: Uses high-pressure peroxide to create uniform molecular bonds.
PEX-B: Exposed to steam/silane for cross-linking; less uniform.
2. Flexibility and Kink Resistance
PEX-A:
Highly flexible; can be bent to a tighter radius (e.g., 6x diameter).
Self-repairing: Kinks can often be healed with a heat gun.
PEX-B:
Stiffer; requires more effort to bend.
Kinks are permanent; damaged sections must be cut out.
3. Durability and Performance
| Factor | PEX-A | PEX-B |
| Freeze Resistance | Excellent (expands/contracts safely) | Good (may crack under severe stress) |
| Chlorine Resistance | Higher (longer lifespan in chlorinated water) | Moderate |
| Pressure Rating | 160 PSI at 73°F | 160 PSI at 73°F |
4. Installation Methods
PEX-A:
Best for expansion fittings (e.g., Uponor ProPEX).
Compatible with crimp/clamp fittings but not ideal.
PEX-B:
Designed for crimp/clamp fittings.
Not suitable for expansion systems.
5. Cost Comparison
PEX-A: 20-40% more expensive due to complex manufacturing.
PEX-B: Budget-friendly; widely used in residential projects.
6. Best Applications
PEX-A:
Radiant heating systems (superior flexibility).
Cold climates (freeze-resistant).
High-end plumbing projects.
PEX-B:
Standard potable water lines.
DIY projects (easier crimp installations).
Budget-conscious builds.
Which Should You Choose?
Choose PEX-A if you need maximum flexibility, freeze resistance, and long-term reliability.
Choose PEX-B for cost savings and straightforward crimp-style installations.
About IFAN Plumbing Manufacturer
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Color, size and packaging are all customizable.
We provide you with a perfect and reasonable solution for your project.
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