What is Polychlorotrifluoroethylene? (PCTFE)
Polychlorotrifluoroethylene (PCTFE) is a high-performance fluoropolymer known for its exceptional chemical resistance, mechanical strength, and stability in extreme environments. Originally developed in the mid-20th century, it has become a go-to material for demanding engineering applications where reliability and longevity are mission-critical.
At Fluorocarbon, we work with PCTFE in both semi-finished forms (rods, tubes, sheet) and precision machined components, helping customers in aerospace, semiconductor, oil & gas, hydrogen/energy and other advanced industries solve difficult design challenges
PCTFE was discovered in 1934 by Fritz Schloffer and Otto Scherer who worked at IG Farben. PCTFE was commercialised under the trade name Kel-F 81 by M K Kellogg in the early 1950’s. This was acquired by 3M in 1957 and manufactured under the brand name of Kel-F®. By 1996, the 3M Company had discontinued manufacturing the resin and sold the rights to Daikin Industries Ltd, who now produces the resin under the brand name Neoflon® PCTFE.
The actual Kel-F® product is no longer available in the marketplace but the name is still used widely in the industry, along with PTCFE.
Table of Contents
Key Material Properties That Set PCTFE Apart
How PCTFE Is Used Across Key Industries
Why Engineers and Designers Choose PCTFE
Learn More and Explore PCTFE Resources
Key Material Properties That Set PCTFE Apart
PCTFE’s unique performance stems from its chemical structure, where chlorine atoms replace some fluorine atoms compared with PTFE. This results in:
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Wide service temperature range: Maintains mechanical integrity from -240 °C to +150 °C (and beyond in some formulations) making it ideal for cryogenic and extreme-temperature applications.
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Low gas and moisture permeability: One of the lowest gas barrier materials among engineering plastics, critical for sealing and containment applications.
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High dimensional stability and hardness: Rigid and less prone to creep than many fluoropolymers.
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Excellent chemical resistance: Withstands aggressive chemicals and solvents, making it suitable for harsh process environments.
These characteristics, documented in our FLUORINOID® FL325 material datasheet, make PCTFE a reliable choice where other materials fail.
If you’d like a deeper comparison between PCTFE and other fluoropolymers like PTFE, we also have an article that breaks down these differences in practical terms. ➝ Read “PTFE vs PCTFE”.
PCTFE is a harder and stronger polymer, with better mechanical properties than PTFE. The crytallisability of PCTFE can be altered by controlling cooling in the melt processing operation; this feature is exploited to get wide varieties in properties and applications. With high Crystallinity, PCTFE is dense with high mechanical properties and elongation. Alternatively, when quench cooled, PCTFE is lighter, transparent and more elastic. The quench cooled PCTFE is widely used in cryogenic engineering applications for handling liquid oxygen and liquid nitrogen. Valve seats made of PCTFE are widely used at cryogenic temperatures.
The effect is shown in the below mentioned stress strain graph:
Figure: Effect of Crystallinity on mechanical properties of PCTFE
How PCTFE Is Used Across Key Industries
Aerospace & Aviation
In aerospace, material performance under extreme temperature, pressure and vacuum is non-negotiable. PCTFE’s low gas permeability and dimensional stability make it ideal for:
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Seals, gaskets and valve seats in fuel, hydraulic and cryogenic systems
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Insulators and components for avionics and high-vacuum environments
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Components where weight, performance and reliability must align without compromise
For many manufacturers and OEMs, these properties help ensure system integrity and safety in flight-critical applications.
Semiconductor Manufacturing
The semiconductor industry demands purity, precision and chemical resistance at every stage of fabrication. PCTFE plays a vital role in supporting these needs:
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Vacuum line seals and cryogenic seals
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High-purity gas delivery systems and valve components
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Chemical handling parts for wet benches, CMP tools and etch chambers
Want a detailed breakdown? See our dedicated article: “PCTFE in Semiconductor Manufacturing: Enabling Purity, Reliability, and Performance.”
Oil & Gas and Cryogenics
PCTFE’s low gas permeability and chemical resistance make it particularly suited for sealing and containment in:
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High-pressure valves, seats and gaskets
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Cryogenic systems handling LNG, liquid hydrogen or helium
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Components operating in corrosive and moisture-rich environments
These applications benefit from PCTFE’s ability to retain mechanical properties at very low temperatures and resist cold flow over time — a requirement in cryogenic transfer and storage systems.
Hydrogen & Energy Systems
Hydrogen technologies demand extremely low permeability and materials capable of performance across broad temperature ranges. PCTFE’s excellent barrier properties and chemical resistance to hydrogen and other gases make it a trusted choice for:
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Seals and valves in hydrogen compression and storage equipment
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High-purity gas controls for fuel cell components
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Infrastructure where gas containment and system reliability are essential
For more context on material selection in hydrogen environments, see our article: “Hydrogen Compatibility: Testing and Material Validation for the Energy Transition.”
Pharmaceuticals & Medical
PCTFE’s ultra-low moisture permeability also drives demand in pharmaceutical packaging, where it protects moisture-sensitive drugs and biologicals. Advanced films and laminates help ensure product stability and regulatory compliance.
Why Engineers and Designers Choose PCTFE
Across markets, PCTFE is chosen when reliability and longevity cannot be compromised:
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Minimal gas and moisture ingress, protecting sensitive systems
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Broad thermal range tolerance for cryogenic to high-heat applications
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Chemical inertness that outperforms many conventional plastics
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Machinability to tight tolerances, enabling precision components when needed
At Fluorocarbon, we pair this performance with world-class CNC machining capabilities, meaning we can deliver finished PCTFE parts, not just semi-finished shapes, to exact customer specifications.
Processing Methods
PCTFE is melt processable by conventional process techniques such as Injection moulding, Extrusion and Compression moulding. However, processing of PCTFE is not as simple as in other materials and this complexity is due to the following reasons: ZST, Crystallinity and Residual stress. ZST, Zero-strength time, is a measure of molecular weight for PCTFE. The processing techniques normally lead to drop in ZST. Normally compression moulding gives higher ZST product than extrusion and injection moulding product. Higher ZST gives good physical properties and normally measured as described in ASTM D1430.
Crystallinity has a direct effect on its properties and it is generally affected by ZST and rate cooling in the melt processing operation. Residual stress is mainly developed during melt processing operation. The factors that affect residual stress are type of processing operation, exposure to shear and rate of cooling. Generally, compression moulding gives lower residual stress than other operations. Another way to reduce residual stress is to anneal the product at high temperature to relieve the stress. At Fluorocarbon, the processes are designed and optimised by understanding the melt rheological properties of PCTFE to give best ZST, lower residual stress, good machinability and long service.
Learn More and Explore PCTFE Resources
- Our PCTFE material page - stock shapes, capabilities and applications.
- PCTFE in semiconductor manufacturing - deep dive into process-critical applications.
- PTFE vs PCTFE - understand the performance differences and design implications.
- PCTFE Cryogenic Seals for LNG Loading Arms - practical case studies.
To find out how we can support your projects contact info@fluorocarbon.co.uk
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