Difference between PEX A and PEX B

When it comes to plumbing systems, PEX tubing has emerged as a favorite among professionals because of its flexibility, durability, and cost-effectiveness. But, not all PEX tubing is created equal. There are two types of PEX tubing widely used in plumbing systems, namely PEX A and PEX B. While both have similar properties, there are some key differences that you need to know when choosing the right type of PEX tubing for your project. In this article, we will discuss the differences between PEX A and PEX B and their applications.

What is PEX A?

PEX A is a type of cross-linked polyethylene tubing that is manufactured using the Engel method. This method involves irradiating the polyethylene material under high pressure and temperature to create crosslinks between the molecules. This process results in a more uniform and stronger bond between the molecules, making PEX A more flexible and resistant to cracks and leaks at low temperatures.

Examples of PEX A

PEX A is typically found in residential and commercial plumbing systems such as hot and cold water supply lines, radiant floor heating systems, and hydronic heating systems. It is also used in the production of flexible hoses and tubing for medical and food industries.

Uses of PEX A

• Hot and cold water supply lines
• Radiant floor heating systems
• Hydronic heating systems
• Potable water systems
• Flexible hoses and tubing for medical and food industries

What is PEX B?

PEX B is a type of cross-linked polyethylene tubing that is manufactured using the Silane method. This method involves extruding the polyethylene material through a machine and then cross-linking it with a chemical compound called silane. This process results in a lower crosslink density compared to PEX A, making it less flexible but more affordable.

Examples of PEX B

PEX B is typically found in residential and commercial plumbing systems such as hot and cold water supply lines, radiant floor heating systems, and hydronic heating systems.

Uses of PEX B

• Hot and cold water supply lines
• Radiant floor heating systems
• Hydronic heating systems
• Potable water systems

Differences Table

Difference Area	PEX A	PEX B
Production Method	Manufactured using the Engel Method	Manufactured using the Silane Method
Flexibility	More flexible	Less flexible
Strength	Stronger bond between molecules	Weaker bond between molecules
Resistance to cracking	High resistance to cracking at low temperatures	Lower resistance to cracking at low temperatures
Cost	More expensive	Less expensive
Installation Method	Expansion fittings and compression rings	Crimp fittings
UV Resistance	More resistant to UV rays	Less resistant to UV rays
Oxygen Barrier	Better oxygen barrier	Lower oxygen barrier
Applications	Suited for residential and commercial plumbing, as well as medical and food industries	Suited for residential and commercial plumbing
Temperature Range	Can handle high temperatures up to 200°F	Can handle high temperatures up to 180°F

Conclusion

While both PEX A and PEX B have similar uses and applications, they differ in terms of flexibility, strength, cost, and installation method. PEX A is more expensive but has better resistance to cracking and UV rays, making it suitable for a wider range of applications, including medical and food industries. PEX B, on the other hand, is less expensive and is typically used for residential and commercial plumbing systems.

Knowledge Check

1. What is the production method for PEX A?

Manufactured using the Engel Method

2. Which type of PEX tubing is more flexible?

PEX A

3. What is the installation method for PEX B?

Crimp fittings

4. Which type of PEX tubing has better resistance to UV rays?

PEX A

5. At what temperature can PEX A handle?

Up to 200°F

6. Which type of PEX tubing is less expensive?

PEX B

7. Which PEX tubing is typically used in the production of flexible hoses and tubing for medical and food industries?

PEX A

8. What chemical compound is used to crosslink PEX B?

Silane

9. What is the difference in crosslink density between PEX A and PEX B?

PEX A has a higher crosslink density compared to PEX B

10. Which type of PEX tubing has a better oxygen barrier?

PEX A

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• Types of Fittings for PEX Tubing
• PEX vs Copper Piping: The Pros and Cons
• The Benefits of Using PEX Tubing in Plumbing Systems