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Acetal / Delrin Homopolymer

Acetal provides high strength and stiffness coupled with enhanced dimensional stability and ease of machining. As a semi-crystalline material, acetal is also characterized by a low coefficient of friction and good wear properties –– especially in wet environments. Because acetal absorbs minimal amounts of moisture, its physical properties remain constant in a variety of environments. Low moisture absorption results in excellent dimensional stability for close tolerance machined parts. In high moisture or submerged applications, acetal bearings outperform nylon 4 to 1.

Acetal is ideally suited for close tolerance mechanical parts and electrical insulators which require strength and stiffness. It also offers resistance to a wide range of chemicals, including many solvents. Homopolymer acetal is most commonly recognized as Delrin, resins that are currently made by the DuPont Company under the trade name Delrin® AF. Homopolymers have slightly higher mechanical and thermal properties than Copolymers. Homopolymer, Unfilled Delrin® natural and black are FDA, USDA, NSF, Canada AG and 3A-Dairy compliant.

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  • Greater stiffness, with higher flexural modulus at room and elevated temperature applications
  • Slightly higher tensile and impact strength at room temperatures
  • Slightly harder, thus giving the homopolymer acetals a lower coefficient of friction

Product Features:

  • Continuous use temperature of 185 °F
  • Excellent dimensional stability
  • High Strength and stiffness
  • Low moisture absorption
  • Excellent creep resistance
  • Good sliding properties
  • Outstanding electrical properties

 

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Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.

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At a Glance

Generic Name
Polyoxymethylene, Unfilled

Available In
Sheet, Rod, Tube, Film

Certifications
FDA, USDA, NSF, Canada AG and 3A-Dairy compliant, ITAR Registered

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Stock Products Properties Applications Advantages Grades Downloads

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TypeSizeLengthColor
Sheet 3/8″ – 2″ TH 12″ x 48″, 24″ x 48″, 48″ x 96″ Natural, Black
Rod 1/4″ – 6″ DIA 96″, 120″ Natural, Black
Tube Custom Custom Natural, Black
Film Custom Custom Natural, Black

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

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Physical PropertiesUnitsASTMResults
Density g/cc D792 1.41
Water Absorption. 24 hrs % D570 20
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 9500
Tensile Modulus psi D638 400
Tensile Elongation @Break % D638 30
Flexural Strength psi D790 12000
Flexural Modulus psi D790 400
Compressive Strength psi D695 15000
Compressive Modulus psi D695 400
Hardness. Rockwell R D785 120
IZOD Impact Strength Notched ft-lb/in D256 1
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion Expansion (x 10-5 in./in./°F) D256 4.7
Heat Deflection Temp at 264 psi °F D648 220
Melting Temperature °F D3418 335
Max Operating Temp °F 180
Thermal Conductivity BTU-in/ft2-hr-°F C177 2.5
Flammability Rating UL94 HB

 

Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 420
Dielectric Constant D150 3.8
Dissipation Factor D150 0.005
Volume Resistivity. 50% RH ohm-cm D257 10^15

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.

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  • Bearings
  • Bushings
  • Electrical components
  • Gears
  • Rollers
  • Structural keels

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  • Excellent wear resistance
  • Very good strength. stiffness
  • Good heat resistance
  • Excellent chemical resistance
  • Opaque

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  • Acetal Copolymer. unfilled
  • Acetal Homopolymer. unfilled – Delrin®
  • Acetal Homopolymer. PTFE filled – Delrin®
  • Glass Reinforced
  • Static Control
  • Electrostatic

NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-434-7432.

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