Looking for High-Performance Plastic Components?

HDPE is an acronym for High Density Polyethylene. Most commonly referred to as HDPE. It is famous for its chemical resistance, toughness, and low cost. It is also FDA, USDA and NSF compliant. It’s natural color is white, but is available in black and other colors at special request. Typical applications include tanks, vessels. Food cutting boards, light duty guides and rails. Not typically used in bearing applications (As UHMW would). HDPE is easily cut and (plastic) welded into custom and standard boxes and tanks for chemical storage and transport. HDPE is easily machined into custom components with standard metal working equipment, however, it has a high coefficient of thermal expansion making it difficult to hold close tolerance dimensions. Its main attributes are impact and chemical resistance. Ease of manufacturing custom components and its low cost makes HDPE a great choice for many vessel, and enclosure applications.

Specification Test Value Units
Specific Gravity, 73°F D792 .95 gm/cm3
Tensile Strength @ Yield, 73°F D638 4,000 psi
Tensile Modulus of Elasticity, 73°F D638 120,000 psi
Tensile Elongation (at break), 73°F D638 600 %
Flexural Strength, 73°F D790 210,000 psi
Flexural Modulus of Elasticity D790   psi
Shear Strength, 73°F D732   psi
Compressive Strength - Ultimate   500 psi
Compressive Strength at 2% Deformation D695   psi
Compressive Strength at 10% Deformation D695 1,000 psi
Deformation Under Load     %
Compressive Modulus of Elasticity, 73°F D695    
Compressive Strength ⊥ to Laminate (Modulus)   750 psi
Compressive Strength ⊥ to Laminate (Yield)   750 psi
Compressive Strength ⊥ to Laminate (Ultimate)   750 psi
Hardness, Durometer (Shore "D" scale) D2240 68  
Hardness, Rockwell (Scale as noted) D785   Rockwell M
Izod Impact, Notched @ 73°F D256 Type A 3.5 ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM55007 .30-.31  
Coefficient of Friction (Dry vs Steel) Dynamic PTM55007 .20-.29  
Maximum Static Bearing Load (P) PTM55007 750 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM55007   ft/minute
Maximum Limiting PV (Unlubricated) PTM55007   psi x ft/min.
Wear Factor "K" x 10-10 PTM55010   Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion Test   90 UHMW=100
Minimum Mating Surface Hardness     Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831(TMA) 6 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831(TMA) 6 in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831(TMA) 6 in/in/°F x 10-5
Softening Point   180 °F
Heat Deflection Temperature 264 psi D648 175 °F
Embrittlement Temperature   -180 °F Min.
Continuous Service Temperature in Air   180 °F Max.
Short Term Service Temperature   200 °F Max.
Tg-Glass Transition (Amorphous) D3418   °F
Melting Point (Crystalline) Peak D3418 260 °F
Thermal Conductivity F433   BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149 45 Volts/mil
Volume Resistivity D257   ohm/cm
Surface Resistivity D257 <10 x10-14 ohm/cm
Dielectric Constant, 106 Hz D150  2.4  
Dissipation Factor, 106 Hz D150    
Flammability @ 3.1mm(1/8 in.) UL94 UL94 HB 1/8 inch
Arc Resistance     seconds
Water Absorption, Immersion 24 Hours D570 (2) Nil %
Water Absorption, Immersion Saturation D570 (2) Nil %
Machinability Rating   3 1=easy, 10=difficult
Rod Diameter Availability (Off the Shelf)  .50 10 inches
Sheet Thickness Availability (Off the Shelf) .125 3.5 inches