Material Information

Delrin® AF Blend belongs to the acetal family of materials. Acetals are thermoplastics with the chemical name “PolyOxyMethylene” (POM). Overall, acetal provides high strength and stiffness, enhanced dimensional stability, low moisture absorption, a low coefficient of friction, good wear and abrasion properties, good chemical resistance, and is easy to machine. Moisture, lubricants, and solvents including gasoline have little effect on acetal, making them ideal for parts incorporating self-threading screws or interference fits. Acetals are available in a copolymer grade, a homopolymer grade (Delrin®), and a variety of filled Delrin® grades.

The Delrin® AF Blend is a 2:1 blend of Delrin® AF 100 and Delrin® 150 resins. It is manufactured from the Delrin® resins and then uniformly filled with PTFE fibers. These fibers provide better wear characteristics for Delrin® AF than the unfilled grade. It retains 90% of the mechanical strength of the unfilled acetal homopolymer while also offering a low coefficient of friction and slip resistance. This makes Delrin® AF ideal for use in moving parts that require low friction and a long wear life. It is available in the color dark brown in the form of rod or plate.

Delrin® AF blend is approximately 13% PTFE filler, where the unblended Delrin® AF 100 is approximately 20% PTFE filler. These additional fibers decrease the wear capability and impact strength of the material, but it offers a slightly higher limiting PV, and a lower coefficient of friction.


  • Non-lubricated bearings and slides
  • Precision instruments
  • Measuring devices
  • Moving parts
  • Automotive industry
  • Specialty valves
  • Machinery
  • Parts that require low friction and long wear life


  • No slip stick
  • Low coefficient of friction
  • Excellent PV values
  • Excellent bearing properties
  • Self-lubricating
  • Good surface hardness/resilience
  • Good dimensional stability
  • Excellent machinability


Astm Test Method

Delrin® AF Blend

Density (lb/in^3) D792 0.054
Specific Gravity D792 1.5
Water Absorption @ 24 hours (%) D570 0.2


Tensile Strength (PSI) D638 8,000
Tensile Modulus (PSI) D638 435,000
Tensile Elongation at Break (%) D638 15
Flexural Strength (PSI) D790 12,000
Flexural Modulus (PSI) D790 435,000
Compressive Strength (PSI) D695 16,000
Compressive Modulus (PSI) D695 350,000
Izod Impact (Notched), ft-lb/in D256 0.7
Rockwell Hardness D785 M85, R115


Coefficient of Thermal Expansion,
D696 5
Heat Deflection Temperature 264 psi, ºF D648 244
Melting Point, °F D3418 347
Continous Service Temp (Operating), °F  – 180
Thermal Conductivity, BTU-in/hr-ft² °F F433
Flammability Rating UL94 HB


Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 400
Volume Resistivity (ohm/square) D257 3.0 x 10^16
Dielectric Constant at 1 MHz D150 3.1
Dissipation Factor at 1 MHz D150 0.01


The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.