Acetal copolymer is a family of engineering thermoplastics based on formaldehyde polymerization technologies.  Acetals have an exceptional balance of tensile properties, shear strength, stiffness and toughness.  They are natural bearing materials because they exhibit a very low friction coefficient against metals, acetal and other plastics.  Delrin® is the brand name for the homopolymer acetal and is a highly versatile engineering plastic with metal like properties.

CCT Precision Machining is an industry leader in Delrin® and Acetals machining.  We are able to maintain tolerances, create features and produce parts that even the material manufacturers deem impossible. By using high speed spindles capable of turning at 30,000 RPM, tightly controlled work envelopes and cutting edge work holding systems, CCT Precision can machine thermoplastic components from the most simple part to the most intricate part on any of the 25+ machines in our facility.

  • 27” x 15” x 13” Work Envelope
  • Tolerances to +/- .00025” (0.006 mm)
  • Hole Diameters to 0.003” (0.076 mm)

If precision machining of Delrin® parts is what you are looking for, Request a Quote today.

Acetron GP AcetalDelrin AcetalDelrin 570 Blend25% Glass-Filled Acetal CopolymerDelrin AF-Filled AcetalAcetron NS-Filled AcetalDelrin 500 CL
MechanicalASTM Test MethodPolyoxy-methylene CopolymerPolyoxy-methylene Homopolymer20% Glass-Filled POM Homopolymer25% Glass-Filled POM HomopolymerPTFE-Filled POM HomopolymerLubricated POM CopolymerLubricated POM HomopolymerUnits
Strength to Weight Ratio--------ksi
Specific Gravity @73 FD7921.411.411.561.591.501.441.42-
Tensile Strength @73 F, (ult)/(yld)D6389,500 (ult)11,000 (ult)8,500 (ult)16,000 (yld)8,000 (ult)7,500 (ult)9,500 (yld)psi
Tensile Modulus of Elasticity @73 FD638400,000450,000900,0001,200,000435,000400,000450,000psi
Tensile Elongation at Break @73 FD6383030122-3%151040%
Flexural Strength @73 FD79012,00013,00010,700-12,00015,00013,000psi
Flexural Modulus of Elasticity @73 FD790400,000450,000730,0001,050,000445,000400,000400,000psi
Shear Strength @73 FD7328,0009,000--76,0006,000-psi
Comprehensive Strength, (% Deformation) @73 FD69515,000 (10)16,000 (10)--16,000 (10)15,000 (10)4,500 (10)psi
Comprehensive Modulus of Elasticity @73 FD695400,000450,000--350,000315,000-psi
Hardness, Rockwell, Scale as noted @73 FD785M88 (R120)M89 (R122)M90 (R118)M80M85 (R115)M85 (R116)M90 (R120)-
Hardness, Durometer, Shore D @73 FD2240D85D86--D83D83--
Izod Impact, (Notched) @73 FD256 Type A1.01.00.81.10.70.71.4ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic-0.250.250.34-0.190.20--
Limiting PV, (with 4 to 1 factor of safety applied)-2,7002,700--7,5007,500-psi-ft/min
ThermalASTM Test MethodPolyoxy-methylene CopolymerPolyoxy-methylene Homopolymer20% Glass-Filled POM Homopolymer25% Glass-Filled POM HomopolymerPTFE-Filled POM HomopolymerLubricated POM CopolymerLubricated POM HomopolymerUnits
Coefficient of Linear Thermal Expansion @73 FE-831 (TMA)5.4E-044.7E-054.5E-052.2E-055.0E-054.7E-056.8E-05in/in/F
Heat Deflection Temperature @264 psiD648220250316322244250257F
Tg-Glass transition termperature, (Amorphous)D3418-------F
Melting Point, (VS=Vicat Softening Temp.)D3418335347347-347347347F
Continuous Service Temperature in Air, (Max.)-180180185-180180-F
Thermal Conductivity-1.602.5-----BTU-in /
hr-ft2-F
ElectricASTM Test MethodPolyoxy-methylene CopolymerPolyoxy-methylene Homopolymer20% Glass-Filled POM Homopolymer25% Glass-Filled POM HomopolymerPTFE-Filled POM HomopolymerLubricated POM CopolymerLubricated POM HomopolymerUnits
Dielectric Strength, Short TermD149420450490-400350400Volts/mil
Volume ResistivityD2571.0E+171.0E+155.0E+14-3.0E+161.0E+151.0E+15ohm-cm
Dielectric Constant @10E6 HzD1503.83.7--3.1-3.5-
Dissipation Factor @10E6 HzD1500.0050.0050.006-0.010-0.006-
Flammability @3.1 mm unless notedUL94HBHBHB-HBHBHB (0.78mm)-
H2OASTM Test MethodPolyoxy-methylene CopolymerPolyoxy-methylene Homopolymer20% Glass-Filled POM Homopolymer25% Glass-Filled POM HomopolymerPTFE-Filled POM HomopolymerLubricated POM CopolymerLubricated POM HomopolymerUnits
Water Absorption, Immersion, 24 hoursD570(7)0.200.200.250.290.200.200.27% by weight
Water Absorption, SaturationD570(7)0.900.901.00-1.00.900.90% by weight