Acetal Copolymer (Delrin®) (Celcon®) (Acetron®)

Acetal (Copolymer) is an engineering thermoplastic polymer that provides good strength and stiffness.  Commonly known as Delrin® or Celcon® or Acetron®, it is easily machined with conventional metal working equipment and can be machined to very close tolerances. Both sheet and rod are available in many thicknesses and diameters.  Rod stock comes ground to diameter to accommodate through spindle turning.  Standard colors are black and (opaque) milk white, while custom colors are available as custom runs. Also, copolymer acetals offer little or no centerline/core porosity making it the preferred acetal for food contact or medical applications.

Acetal (Copolymer) is non hygroscopic and is normally FDA, USDA, Canada AG and 3A-Dairy compliant in both black and white colors.  It absorbs minimal amounts of moisture and can be cleaned easily.  As a result, it finds applications in high moisture, food handling, medical and marine components.

Although it has many benefits as an unfilled material, Acetal (Copolymer) can be filled with solid lubricants to enhance its bearing and wear properties. Materials such as PTFE Teflon®, MoS2, Graphite and oil are all available in standard sizes.

Specification Test Value Units
Specific Gravity, 73°F D792 1.41
Tensile Strength @ Yield, 73°F D638 9,500 psi
Tensile Modulus of Elasticity, 73°F D638 400,000 psi
Tensile Elongation (at break), 73°F D638 30 %
Flexural Strength, 73°F D790 12,000 psi
Flexural Modulus of Elasticity D790 400,000 psi
Shear Strength, 73°F D732 8,000 psi
Compressive Strength – Ultimate 1,000 psi
Compressive Strength at 2% Deformation D695 1,000 psi
Compressive Strength at 10% Deformation D695 15,000 psi
Deformation Under Load 2 %
Compressive Modulus of Elasticity, 73°F D695  400,000
Compressive Strength ⊥ to Laminate (Modulus)  1,000 psi
Compressive Strength ⊥ to Laminate (Yield)  1,000 psi
Compressive Strength ⊥ to Laminate (Ultimate)  1,000 psi
Hardness, Durometer (Shore “D” scale) D2240  D85
Hardness, Rockwell (Scale as noted) D785 120 Rockwell R
Izod Impact, Notched @ 73°F D256 Type A 1.0 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM 55007 0.30
Coefficient of Friction (Dry vs Steel) Dynamic PTM 55007 0.25
Maximum Static Bearing Load (P) PTM 55007 1,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM 55007 15 ft/minute
Maximum Limiting PV (Unlubricated) PTM 55007 2,700 psi x ft/min.
Wear Factor “K” x 10-10 PTM 55010 200 Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test  60 UHMW=100
Minimum Mating Surface Hardness 20 Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831 (TMA) 5.4 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831 (TMA) 5.4 in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831 (TMA) 5.4 in/in/°F x 10-5
Softening Point  220 °F
Heat Deflection Temperature 264 psi D648  220 °F
Embrittlement Temperature °F Min.
Continuous Service Temperature in Air 180 °F Max.
Short Term Service Temperature 212 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystalline) Peak D3418  335 °F
Thermal Conductivity F433  1.6 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149 420 Volts/mil
Surface Resistivity D257  >1013 ohm/cm
Volume Resistivity D257 ohm/cm
Dielectric Constant, 106 Hz D150  3.8
Dissipation Factor, 106 Hz D150  0.005
Flammability @ 3.1mm(1/8 in.) UL94 UL94  HB
Arc Resistance seconds
Water Absorption, Immersion 24 Hours D570 (2) 0.2 %
Water Absorption, Immersion Saturation D570 (2) 0.9 %
Machinability Rating 1 1=easy, 10=difficult
Rod Diameter Availability (Off the Shelf) .125 60 inches
Sheet Thickness Availability (Off the Shelf) .030 3.0 inches
Characteristics / Attributes Rigid / Stiff / Porosity Free / Excellent Machinability