PCTFE Sheets

PCTFE sits at the top end of the fluoropolymer range, and in sheet form its characteristics make it indispensable for sealing, high-purity and low-temperature work:

• Exceptional dimensional stability and high resistance to cold flow, so gaskets and machined parts hold their tolerances under sustained load.
• Excellent cryogenic performance, keeping mechanical integrity down to extremely low temperatures.
• Outstanding gas and moisture barrier, with the lowest water vapour transmission rate of the common fluoropolymers.
• Very low outgassing, which makes PCTFE suitable for vacuum and aerospace applications.
• Optical transparency in thin, low-crystalline form, ideal for sight glasses and windows.
• Excellent chemical resistance to most acids, bases and oxidising agents.
• Non-flammable with a high limiting oxygen index, plus radiation resistance and stable electrical insulation.
• Food contact compliant, meeting FDA and EU 10/2011 requirements.

The production route matters for a flat part. Alongside sheet cut from larger stock, Vanéflon produces PCTFE plates and billets using cold and hot compression moulding. Moulding gives constant material quality and uniform, ultra-low residual stress across the whole plate, which is exactly what high-precision machining of gaskets and seals demands. Lower residual stress means tighter, more stable tolerances and significantly less machining scrap.

With hundreds of moulds in house, we press plates as close to your final dimensions as possible, a near-net approach that reduces machining time, cuts material waste and shortens lead times. 

If your project calls for a size we do not already hold, Vanéflon can produce its own moulds at short notice. Every PCTFE sheet leaves our facility with full traceability and certification, and post-treatment such as tempering, grinding and cutting is available on request.

In thin, low-crystalline form PCTFE becomes optically clear, with the material looking similar to glass. Combined with its chemical resistance and near-zero moisture absorption, this makes transparent PCTFE sheet a proven choice for sight glasses, observation windows and inspection ports in aggressive process environments where ordinary glass would fail. If your application calls for a see-through, chemically resistant panel, PCTFE is worth considering.

PCTFE has extremely low outgassing, which is why it is trusted for aerospace, flight and vacuum applications where contamination and material loss cannot be tolerated. In sheet form it serves as structural material, insulation and moisture-barrier components for sensitive electronics and instrumentation.

Choosing a fluoropolymer is a question of the application. 

• Compared to PTFE and PFA, PCTFE is harder, more rigid and more dimensionally stable, with a far better moisture and gas barrier and the advantage of optical transparency, which is why it wins for precision cryogenic sealing and sight glasses. 
• PTFE remains the softer, lower-friction and more cost-effective choice for less demanding tolerances, PVDF offers a strong balance of chemical resistance and mechanical strength at a lower cost, and PEEK delivers higher mechanical strength at elevated temperatures.
•  PCTFE is more expensive than PTFE, but for cryogenic, vacuum and high-end aerospace work it remains indispensable. 

If you are weighing up materials, our specialists are happy to help you decide.

The two are related but serve different purposes. PCTFE sheet and plate are rigid, semi-finished stock intended for machining into gaskets, seals and precision parts. 

PCTFE film is a much thinner product, often used as a moisture barrier in pharmaceutical blister packaging and as a laminating layer. 

If you need a machinable, self-supporting flat stock, sheet or plate is what you are after. For film applications, get in touch and we will point you in the right direction.