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Delrin 570is a 20% glass filled acetal homopolymer blend. DuPont Delrin® is a popular acetal homopolymer brand name, and the most commonly used acetal homopolymer. The combination of glass in Delrin® acetal resin gives this material excellent stiffness, strength, and stability. This combination offers higher mechanical properties at elevated temperatures.

It is commonly utilized in spools, fixtures, and electrical components where dimensional stability and enhanced mechanical and insulating properties are required.

Available in sheet and rod, it is easily machined with standard metal working equipment. Tolerances of +/-.0005 can be achieved with experience. The glass can lead to some premature wear of tooling, so care should be taken to avoid excessive tool speeds.

Specification Test Value Units
Specific Gravity, 73°F D792 1.56
Tensile Strength @ Yield, 73°F D638 7700 psi
Tensile Modulus of Elasticity, 73°F D638 860000 psi
Tensile Elongation (at break), 73°F D638 10 %
Flexural Strength, 73°F D790 14500 psi
Flexural Modulus of Elasticity D790 650000 psi
Shear Strength, 73°F D732 - psi
Compressive Strength – Ultimate - psi
Compressive Strength at 1% Deformation D695 1500 psi
Compressive Strength at 10% Deformation D695 14500 psi
Deformation Under Load < 2 %
Compressive Modulus of Elasticity, 73°F D695 -
Compressive Strength ⊥ to Laminate (Modulus) psi
Compressive Strength ⊥ to Laminate (Yield) 1450 psi
Compressive Strength ⊥ to Laminate (Ultimate) 1450 psi
Hardness, Durometer (Shore “D” scale) D2240 D83
Hardness, Rockwell (Scale as noted) D785 87 Rockwell M
Izod Impact, Notched @ 73°F D256 Type A 0.6 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM 55007 -
Coefficient of Friction (Dry vs Steel) Dynamic PTM 55007 -
Maximum Static Bearing Load (P) PTM 55007 - psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM 55007 - ft/minute
Maximum Limiting PV (Unlubricated) PTM 55007 - psi x ft/min.
Wear Factor “K” x 10-10 PTM 55010 - Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test - UHMW=100
Minimum Mating Surface Hardness - Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831 (TMA) 4.72 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831 (TMA) 4.72 in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831 (TMA) 4.72 in/in/°F x 10-5
Softening Point - °F
Heat Deflection Temperature 264 psi D648 311 °F
Embrittlement Temperature - °F Min.
Continuous Service Temperature in Air 185 °F Max.
Short Term Service Temperature 300 °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 452 Volts/mil
Volume Resistivity D257 >8x1014 ohm/cm
Surface Resistivity D257 >2x1015 ohm/cm
Dielectric Constant, 106 Hz D150 3.8
Dissipation Factor, 106 Hz D150 0.006
Flammability @ 1.47mm(1/16 in.) UL94 UL94 HB
Arc Resistance seconds
Water Absorption, Immersion 24 Hours D570 (2) 0.15 %
Water Absorption, Immersion Saturation D570 (2) 1 %
Machinability Rating 3 1=easy, 10=difficult
Rod Diameter Availability (Off the Shelf) 0.125 6 inches
Sheet Thickness Availability (Off the Shelf) 0.25 3 inches