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

Differences Between PCTFE and PTFE

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. 

PTFE (polytetrefluoroethylene) is a soft, low friction fluoropolymer with outstanding chemical resistance  and weathering resistance. PTFE is stable at temperatures up to 500°F and it is often used in high temperature environments. PTFE also has excellent electrical insulating properties.

PCTFE Material Characteristics
  • Broad chemical resistance
  • High purity
  • High compressive strength
  • Retention of ductility at cryogenic temperatures
  • Good resistance to creep (cold-flow) for a fluoropolymer
  • Relatively stable thermal expansion coefficient across temperature extremes
  • Very low gas permeability (excellent barrier properties)
  • Excellent flammability characteristics and oxygen compatibility
  • Good radiation resistance
PCTFE Applications:
  • Chemical processing components
  • Valve seats, seals, and gaskets
  • Chromatography columns
  • Liquid oxygen and liquid nitrogen valve linings
  • Moisture barriers 
PEEK Common Brands
  • Neoflon®, Kel-F®, Aclon®
PTFE Material Characteristics
  • Broad chemical resistance
  • Moderate compressive strength at cryogenic temperatures
  • High compressive modulus at cryogenic temperatures
  • Poor creep characteristics unless reinforced with fillers
  • Retention of ductility at cryogenic temperatures
PTFE Applications:
  • Seals and gaskets
  • Valve and fitting components
  • Pump parts
  • Manifolds
  • Semiconductor equipment
  • Scientific equipment
  • Chemical resistant tubing
  • Bearings and bushings (bearing grades)
PTFE Common Brands
  • Rulon®, Fluorosint®


Typical properties of PCTFE and PEEK
Specific gravity   D792 2.11 - 2.17 2.15
Water absorption
(immersion 24 hours)
% D570 0 <0.01
Tensile strength psi D638 4,860 - 5,710 1,500 - 3,000
Elongation % D638 100 - 250 100-200
Izod Impact (notched) ft-lbs/in D256 2.5 - 3.5 3.5
Flexural strength psi D790 9,570 - 10,300
Flexural modulus psi D790 200,000 - 243,000 72,000
Dielectric strength (short term) v/mil D149 500 400-500
Coefficient of linear
thermal expansion
in/in/°Fx10-5 D696 3.9 8.9
Coefficient of friction (dynamic)     0.10
Max continuous
service temperature in air
°F   380°F 500°F
Hardness   Scale
as noted
D785, D2240
Shore D 90 Shore D 55

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