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Delrin® 13% AF blend, supplied as a 2:1 blend of Acetal AF-100 and Acetal 150 resins, has excellent friction properties. Bearings made of Acetal AF blend can operate at higher speeds while exhibiting reduced wear. These bearings are also essentially free of slip-stick behavior because the static and dynamic coefficient of friction are closer than with most plastics. Acetal AF blend retains 90% of the strength that is inherent in unmodified Acetal. Some properties are changed due to the addition of the softer PTFE fiber. The natural color of Acetal AF blend is dark brown.

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At a Glance

Generic Name
Polyoxymethylene, Polyacetal

Available In
Sheet, Rod

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Technical Information

Stock Products Properties Applications Advantages

Stock Products

Sheet .250 – 3” 24” x 48’, 12” x 48”, 48” x 96” Dark Brown
Rod .250 – 3″ 96”, 120” Dark Brown

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.054
Water Absorption, 24 hrs % D570 0.2
Mechanical PropertiesUnitsASTMResults
Tensile Strength @ yield psi D638 8000
Tensile Modulus psi D638 435000
Tensile Elongation @Break % D638 15
Flexural Strength psi D790 12000
Flexural Modulus psi D790 435000
Compressive Strength psi D695 16000
Compressive Modulus psi D695 35000
Hardness, Rockwell R D785 115
IZOD Impact Strength Notched ft-lb/in D256 0.7
Thermal PropertiesUnitsASTMResults
Coeffcient of Linear Thermal Expansion (x 10^-5 in./in./°F) 5.0
Heat Deflection Temp at 264 psi °F 224
Melting Temperature °F 347
Max Operating Temp. °F 180
Thermal Conductivity BTU-in/ft²-hr-°F n/a
Flammability Rating HB
Electrical PropertiesUnitsASTMResults
Dielectric Strength. 1/8″ th. V/mil D149 400
Dielectric Constant @1 MHz 3.1
Dissipation Factor@1 MHz D150 0.01
Volume Resistivity, 50% RH ohm-cm D257 3.0 x 10^16

NOTE: The property values presented above 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.


  • Mechanical
  • Electrical Engineering
  • Vehicle
  • Medical
  • Furniture
  • Packaging


  • High hardness and stiffness
  • Very high mechanical properties
  • Excellent creep resistance and dimensional stability
  • Excellent dielectrical properties
  • Low coefficient of friction
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