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Acetal is the common name for a family of thermoplastics with the chemical name “PolyOxy-Methylene.” Acetal is available in a general purpose copolymer grade, a homopolymer version Delrin®. and several filled Delrin® grades. Acetal provides high strength and stiffness. enhanced dimensional stability. and is easy to machine.

As a semi-crystalline material. acetal is characterized by a low coefficient of friction and good wear properties. Acetal homopolymers are available in several viscosity ranges that meet a variety of processing and end-use needs. The higher viscosity materials are generally used for extrusions and for molded parts requiring maximum toughness; the lower viscosity grades are used for injection molding. Elastomer-modified grades offer greatly improved toughness.

A practical difference between the copolymer and the homopolymer is that the copolymer can accept reinforcement much better than the homopolymer. Thus. the strength of the copolymer can be increased far more easily than that of the homopolymer. Both types can be modified by additives such as PTFE (Teflon®) to increase the resistance to wear.

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
PolyOxy-Methylene

Available In
Sheet, Rod, Tube, Film

Certifications
FDA Compliant, ITAR Registered

Brands
Pomalux®, Celcon®, Sustarin®-C, Unital® C, Acetron® GP

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Technical Information

Stock Products Properties Applications Advantages Grades Downloads

Stock Products

TypeSizeLengthColor
Sheet .060 - 6' TH 24" × 48", 12" × 48", 48" × 96" Natural, Black
Rod 1/8" - 12" DIA 96", 120" Natural, Black
Tube 1/2" - 4" ID 120" Natural
Film .010 - .060 TH 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.

Properties

Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.054
Water Absorptions - 24hrs. % D570 0.2
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 9.5
Tensile Modulus psi D638 400
Tensile Elongation @Break % D638 30
Flexural Strength psi D790 12
Flexural Modulus psi 400000 400
Compressive Strength psi D695 15
Compressive Modulus psi D695 400
Hardness. Rockwell R D785 M88/R120
IZOD Impact Strength Notched ft-lb/in D256 1
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) D256 5.4
Heat Deflection Temp at 264 psi °F 220
Melting Temperature °F D3418 335
Max Operating Temp °F 180
Thermal Conductivity BTU-in/ft2-hr-°F C177 1.6
Flammability Rating UL94 HB
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 420
Dielectric Constant D150 3.8 @1 MHz
Dissipation Factor D150 3.8 @1 MHz
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.

Applications

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

Advantages

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

Grades

  • 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 973-862-4148.

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