Delrin® AF Blend


Delrin® AF, Delrin® 100AF and Delrin® AF Blend belong to a family of PTFE Teflon® filled acetals.  They are a unique subset of thermoplastic materials designed for use as bearing and wear components where low friction and long wear life are important.  They are a combination of PTFE fibers (or PTFE powder) uniformly dispersed in Delrin® acetal resin. This combination offers better wear characteristics than unfilled Delrin® due to the presence of PTFE acting as a solid lubricant.  Bearings made of Delrin® AF can operate at higher speeds while extending life to the component. Delrin® AF retains 90% of the strength that is inherent in unmodified Delrin® acetal.  Although there are other variations of PTFE filled acetal available, Delrin® AF Blend is widely available and generally speaking, less expensive.

Available in sheet, rod and tubing, it is ealily machined with standard metal working equipment. Tolerances of +/-.001 can be achieved with experience.

Specification Test Value Units
Specific Gravity, 73°F D792 1.5
Tensile Strength @ Yield, 73°F D638 8,000 psi
Tensile Modulus of Elasticity, 73°F D638 435,000 psi
Tensile Elongation (at break), 73°F D638 15 %
Flexural Strength, 73°F D790 12,000 psi
Flexural Modulus of Elasticity D790 445,000 psi
Shear Strength, 73°F D732 7,600 psi
Compressive Strength – Ultimate 1,000 psi
Compressive Strength at 2% Deformation D695 1,000 psi
Compressive Strength at 10% Deformation D695 16,000 psi
Deformation Under Load < 2 %
Compressive Modulus of Elasticity, 73°F D695 350,000
Compressive Strength ⊥ to Laminate (Modulus) psi
Compressive Strength ⊥ to Laminate (Yield) 1,000 psi
Compressive Strength ⊥ to Laminate (Ultimate) 1,000 psi
Hardness, Durometer (Shore “D” scale) D2240 D83
Hardness, Rockwell (Scale as noted) D785 115 Rockwell R
Izod Impact, Notched @ 73°F D256 Type A 0.7 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM 55007 0.20
Coefficient of Friction (Dry vs Steel) Dynamic PTM 55007 0.19
Maximum Static Bearing Load (P) PTM 55007 1,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM 55007 100 ft/minute
Maximum Limiting PV (Unlubricated) PTM 55007 5,000 psi x ft/min.
Wear Factor “K” x 10-10 PTM 55010 60 Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test 40 UHMW=100
Minimum Mating Surface Hardness 20 Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831 (TMA) 5.0 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831 (TMA) 5.0 in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831 (TMA) 5.0 in/in/°F x 10-5
Softening Point 244 °F
Heat Deflection Temperature 264 psi D648 244 °F
Embrittlement Temperature °F Min.
Continuous Service Temperature in Air 180 °F Max.
Short Term Service Temperature 212 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystalline) Peak D3418 347 °F
Thermal Conductivity F433 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149 400 Volts/mil
Volume Resistivity D257 >1013 ohm/cm
Surface Resistivity D257 ohm/cm
Dielectric Constant, 106 Hz D150 3.1
Dissipation Factor, 106 Hz D150 0.010
Flammability @ 3.1mm(1/8 in.) UL94 UL94 HB
Arc Resistance seconds
Water Absorption, Immersion 24 Hours D570 (2) 0.2 %
Water Absorption, Immersion Saturation D570 (2) 1.0 %
Machinability Rating 1 1=easy, 10=difficult
Rod Diameter Availability (Off the Shelf) .125 6.0 inches
Sheet Thickness Availability (Off the Shelf) .250 3.0 inches
Characteristics / Attributes Low Friction/ Self Lubricating / Wear Resistant