Material Information

Delrin® 150 (unfilled) belongs to the acetal family of materials. Acetals are thermoplastics with the chemical name “PolyOxyMethylene” (POM). Overall, acetal provides high strength and stiffness, enhanced dimensional stability, low moisture absorption, a low coefficient of friction, good wear and abrasion properties, good chemical resistance, and is easy to machine. Moisture, lubricants, and solvents including gasoline have little effect on acetal, making them ideal for parts incorporating self-threading screws or interference fits. Acetals are available in a copolymer grade, a homopolymer grade (Delrin®), and a variety of filled Delrin® grades.

The Delrin® 150 acetal homopolymer offers higher mechanical properties than the acetal copolymer, but slightly less chemical resistance. This makes it ideal for small diameter, thin walled, bushings that benefit from the additional strength and rigidity. Also unlike the acetal copolymer, the Delrin® 150 homopolymer has center line porosity, especially in large cross-sections. Because of this porosity, Delrin® 150 is not compliant with USP class 6 However, it is FDA, USDA, and NSP compliant in the natural grade. Delrin ® 150 is only available in the colors black and natural, in the forms of rod and plate.



  • Garden chemical sprayers
  • Pumps and beverage valves
  • Soap dispensers
  • Water softeners
  • Irrigation components
  • Gears
  • Bearings
  • Bushings
  • Washers
  • Rollers
  • Electrical insulator parts
  • Wear surfaces
  • Gears
  • Conveyers
  • Coil forms
  • Electrical and automotive switch components
  • Clothes dryers
  • Gas caps


  • Excellent moisture and chemical resistance
  • Has center line porosity
  • High tensile strength
  • Excellent fatigue endurance
  • Excellent dimensional stability
  • Good electrical properties
  • Good creep resistance
  • Natural lubricant
  • Excellent machinability
  • FDA, NSF, and USDA approved (natural)


Astm Test Method

Delrin® 150 (Homo-Polymer)

Density (lb/in^3) D792 0.051
Specific Gravity D792 1.41
Water Absorption @ 24 hours (%) D570 0.2


Tensile Strength (PSI) D638 11,000
Tensile Modulus (PSI) D638 450,000
Tensile Elongation at Break (%) D638 30
Flexural Strength (PSI) D790 13,000
Flexural Modulus (PSI) D790 450,000
Compressive Strength (PSI) D695 16,000
Compressive Modulus (PSI) D695 450,000
Izod Impact (Notched), ft-lb/in D256 1
Rockwell Hardness D785 M89, R122


Coefficient of Thermal Expansion,
D696 4.7
Heat Deflection Temperature 264 psi, ºF D648 250
Melting Point, °F D3418 347
Continous Service Temp (Operating), °F   180
Thermal Conductivity, BTU-in/hr-ft² °F F433 2.5
Flammability Rating UL94 HB


Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 450
Volume Resistivity (ohm/square) D257 10^15
Dielectric Constant at 1 MHz D150 3.7
Dissipation Factor at 1 MHz D150 0.005


The information contained herein 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.