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.
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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Water Absorptions - 24hrs.
Tensile Strength @yield
Tensile Elongation @Break
Hardness. Rockwell R
IZOD Impact Strength Notched
Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
Heat Deflection Temp at 264 psi
Max Operating Temp
3.8 @1 MHz
3.8 @1 MHz
Volume Resistivity 50% RH
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.
Excellent wear resistance
Very good strength. stiffness
Good heat resistance
Excellent chemical resistance
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.