Welding is a reliable method for joining fluoropolymer components used in chemical processing, life sciences, and high-purity systems. However, not all fluoropolymers can be welded in the same way, and choosing the right material and method is essential for achieving strong, clean, and leak-free joints.

Weldable Fluoropolymers

Some fluoropolymers are melt-processable, which allows for effective welding using techniques like hot plate, infrared (IR), or contact welding. Below are the grades commonly used for welded assemblies:

·       PVDF: A widely used material for welded parts, PVDF offers good chemical resistance, mechanical strength, and stability after welding. It is suitable for components like tanks, pipework, and chemical lines.

·       PFA: With a higher melt temperature (~300°C), PFA requires careful control during welding but offers excellent chemical resistance and weld integrity. It’s often chosen for ultra-pure applications such as semiconductor and pharmaceutical processing.

·       FEP: Similar to PFA in its melt-processable properties but with a slightly lower processing temperature. FEP is frequently used in fluid transfer systems and chemical containers.

·       ETFE and ECTFE: While not traditional PTFE-family fluoroplastics, these materials offer good weldability and are valued for their toughness and chemical resistance. ECTFE, in particular, balances processability and strength, making it a practical choice for industrial linings and vessels.

These materials can be joined using a combination of fusion welding, IR welding, or butt welding, depending on the joint type and application requirements.

The difference when welding PTFE

PTFE: PTFE cannot be welded using standard thermal welding methods due to its high crystallinity and resistance to flow when heated. We have developed our own techniques and processes to successfully weld PTFE.  If you would like to find out more, please contact our Technical Team

Welding Considerations

Regardless of the material, achieving a reliable weld requires attention to several key factors:

·       Surface Preparation: Clean, smooth surfaces free from contamination are essential to ensure bonding.

·       Joint Design: Proper joint geometry, such as bevelled edges or clean flat faces, supports uniform melting and strength across the seam.

·       Process Control: Welding temperatures must be tightly regulated. Overheating can degrade material properties, while underheating leads to weak joints.

·       Fixtures and Alignment: Precision fixtures ensure parts remain in place during welding. This is especially important in complex geometries or tight-tolerance assemblies.

·       Atmosphere Control: In some cases, welding under inert gas or in filtered air environments helps to reduce oxidation and maintain material integrity.

Applications and Expertise

Adtech specialises in welding fluoropolymer components for demanding environments. We produce welded assemblies such as:

·       Pipe systems and chemical transfer lines

·       Tank linings and storage vessels

·       Custom housings and manifolds

·       Fluid containment solutions for cleanroom and corrosive applications

Using in-house welding systems and experienced technicians, Adtech ensures high consistency and repeatability, critical for sectors where product failure is not an option.

Learn more: Learn more about our welding and sealing capabilities

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