Compare PCTFE and PEEK to identify the best option for your project

Differences Between PCTFE and PEEK

PCTFE is a fluoropolymer material with outstanding strength, stiffness, and dimensional stability. It has excellent chemical and radiation resistance and good flammability characteristics. PCTFE has a broad temperature range, good resistance to cold flow, and it has the lowest coefficient of thermal expansion of any unfilled fluoropolymer.

PEEK (polyetheretherketone) is a high-performance engineering plastic with outstanding resistance to harsh chemicals, and excellent mechanical strength and dimensional stability. PEEK has a broad operating temperature range, offers hydrolysis resistance to steam, and maintains stiffness at high temperatures.

PCTFE sheets and rods | PEEK sheet and rod

PCTFE Material Characteristics

PEEK Material Characteristics

• Broad chemical resistance
• High compressive strength
• Good resistance to creep (cold-flow) for a fluoropolymer
• Retention of ductility at cryogenic temperatures
• Relatively stable thermal expansion coefficient across temperature extremes
• High purity
• Very low gas permeability (excellent barrier properties)
• Excellent flammability characteristics and oxygen compatibility
• Good radiation resistance
• Broad chemical resistance
• High strength, stiffness, and creep resistance to deformation at high temperatures
• Excellent mechanical properties down to -85°F
• Retention of ductility at cold temperatures
• Maximum service temperatures approaching 500°F
• Excellent dimensional stability

PCTFE Applications

PEEK Applications

• Cryogenic and chemical processing components
• Seals and gaskets
• Aerospace valve seats, pump parts, impellers, diaphragms, and plugs
• Laboratory instruments
• Nuclear service/high radiation exposure
• Liquid oxygen and liquid nitrogen valve lining
• Semiconductor machinery components
• Aerospace parts
• Bushings, bearings, seals, and back-up rings
• Pump and valve components
• Vacuum wand handles
• Down hole electrical connectors
• Medical instrument parts
• Food processing machinery components

PCTFE Common Brands

PEEK Common Brands

• Neoflon®, Kel-F®, Aclon® • TECAPEEK®, SustaPEEK, Ketron®

Typical Properties of PCTFE vs. PEEK

Property Units ASTM Test
Specific gravity - D792 2.11 - 2.17 1.32
Water absorption (immersion 24 hours) % D570 0 0.5
Tensile strength psi D638 4,860 - 5,710 14,000
Elongation % D638 100 - 250 60
Izod impact (notched) ft-lbs/in D256 2.5 - 3.5 1.6
Flexural strength psi D790 9,570 - 10,300 24,600
Flexural modulus psi D790 200,000 - 243,000 590,000
Dielectric strength (short term) V/mil D149 500 480
Coefficient of linear thermal expansion in/in/°Fx10-5 D696 3.9 2.6
Coefficient of friction (dynamic) - - - 0.25
Maximum continuous service temperature in air °F - 380 480
Hardness scale as noted D785,
Shore D 90 M105, R126,
Shore D 85

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand. 

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