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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, stiffness enhanced dimensional stability and is easy to machine.

POM Acetal Copolymer

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-user needs. The higher viscosity materials are generally used for extrusions and for molded parts requiring maximum toughness, while the lower viscosity grades are used for injection molding. Elastomer-modified grades offer greatly improved toughness.

A few basic differences between the copolymer and the homopolymer is that the copolymer can accept reinforcement much better than the homopolymer. Because of this, the strength of the copolymer can be increased more easily than the homopolymer. Because copolymer acetals offer little or no centerline/core porosity, it is the preferred acetal for food contact or medical applications. Copolymer and homopolymer 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

Available In
Sheet, Rod, Tube, Film

FDA Compliant, ITAR Registered

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

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Technical Information

Stock Products Properties Applications Advantages Grades Downloads

Stock Products

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.


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.


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


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


  • 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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