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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


PhysicalAstm Test MethodDelrin® AF Blend
Density (lb/in^3)D7920.054
Specific GravityD7921.5
Water Absorption @ 24 hours (%)D5700.2
Tensile Strength (PSI)D6388,000
Tensile Modulus (PSI)D638435,000
Tensile Elongation at Break (%)D63815
Flexural Strength (PSI)D79012,000
Flexural Modulus (PSI)D790435,000
Compressive Strength (PSI)D69516,000
Compressive Modulus (PSI)D695350,000
Izod Impact (Notched), ft-lb/inD2560.7
Rockwell HardnessD785M85, R115
Coefficient of Thermal Expansion,
Heat Deflection Temperature 264 psi, ºFD648244
Melting Point, °FD3418347
Continous Service Temp (Operating), °F180
Thermal Conductivity, BTU-in/hr-ft² °FF433
Flammability RatingUL94HB
Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
Volume Resistivity (ohm/square)D2573.0 x 10^16
Dielectric Constant at 1 MHzD1503.1
Dissipation Factor at 1 MHzD1500.01

Disclosure: 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.


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