Understanding the Different Types of PEX Pipeline: A, B, and C

PEX (cross-linked polyethylene) pipeline are a popular choice for various plumbing and heating applications due to their flexibility, durability, and ease of installation. However, not all PEX pipes are created equal. They come in three main types: PEX-A, PEX-B, and PEX-C, each with distinct characteristics and advantages. Understanding these differences can help you make an informed decision for your specific needs.

PEX-A: Superior Flexibility and Freeze Resistance

Manufacturing Process

PEX-A is produced using the Engel method, which involves high-temperature, high-pressure peroxide cross-linking. This process results in a highly flexible and durable pipe.


PEX-A offers exceptional flexibility, making it easy to install in tight spaces and around corners without the need for many fittings. Its high degree of cross-linking (typically 85%) provides superior freeze resistance, reducing the risk of bursting in cold climates.


Due to its flexibility and freeze resistance, PEX-A is ideal for residential plumbing, radiant floor heating, and snow melting systems. It’s also preferred in retrofitting projects where maneuverability is crucial.

PEX-B: Enhanced Chemical Resistance and Cost-Effectiveness

Manufacturing Process

PEX-B is created using the Silane method, where the cross-linking occurs during the extrusion process and continues over time with moisture exposure. This results in a slightly stiffer but highly chemical-resistant pipe.


PEX-B is known for its excellent chemical resistance, making it suitable for water supply lines exposed to harsh water conditions. It is also more affordable than PEX-A, offering a cost-effective solution for many projects.


PEX-B is commonly used in both residential and commercial water supply systems, including hot and cold water distribution. Its chemical resistance also makes it suitable for industrial applications where exposure to aggressive substances is a concern.

PEX-C: High Flexibility and Ease of Handling

Manufacturing Process

PEX-C pipeline is manufactured through the electron beam method, which uses high-energy electron beams to initiate cross-linking after the extrusion process. This method creates a pipe with balanced flexibility and strength.


PEX-C pipeline combines good flexibility with ease of handling, making it a versatile option for various installations. It also boasts high creep resistance, ensuring long-term performance under continuous pressure.


PEX-C pipeline is often used in potable water systems, radiant floor heating, and hydronic heating systems. Its balance of flexibility and durability makes it a reliable choice for both new installations and retrofits.

Comparing the Types: Choosing the Right PEX for Your Needs

Flexibility and Installation

When it comes to flexibility, PEX-A stands out due to its superior bending capabilities, allowing for easier installations in complex layouts. PEX-C also offers good flexibility, while PEX-B, though slightly stiffer, is still manageable with appropriate tools.

Chemical and Temperature Resistance

For chemical resistance, PEX-B leads the way, making it the best choice for environments with aggressive water conditions. PEX-A and PEX-C both provide excellent temperature resistance, suitable for both hot and cold water applications.

Cost Considerations

Cost is often a deciding factor in material selection. PEX-B is typically the most cost-effective option, providing a balance of performance and affordability. PEX-A, while slightly more expensive, offers unparalleled flexibility and freeze resistance. PEX-C falls in the middle range, offering good value for its versatility.

Longevity and Reliability

All three types of PEX pipeline are designed for long-term reliability, with lifespans often exceeding 50 years. However, the choice between PEX-A, PEX-B, and PEX-C should be guided by specific project requirements and environmental conditions.


Understanding the differences between PEX pipeline is essential for selecting the right type of PEX pipeline for your project. Each type offers unique benefits, and the best choice will depend on factors such as flexibility needs, chemical exposure, budget constraints, and specific application requirements. By carefully considering these factors, you can ensure a successful and efficient PEX pipeline installation.


IFAN is a professional manufacturer with 30 years of experience, dedicated to producing high-quality plastic pipes, fittings, and valves. Our products include brass valves, PPR valves, as well as various pipes and fittings to meet different customer needs. Whether you need plumbing and drainage pipes or valve products, IFAN can provide a diverse range of high-quality, cost-effective products to support your projects. Below is our contact information.

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