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GENERAL DESCRIPTION
Polyethylenes are semi-crystalline materials with excellent chemical resistance, good fatigue and wear resistance, and a wide range of properties (due to differences in length of the polymer chain.) Polyethylenes are easy to distinguish from other plastics because they float in water.
GENERAL PROPERTIES OF POLYETHYLENES
Polyethylenes provide good resistance to organic solvents, degreasing agents and electrolytic attack. They have a higher impact strength, but lower working temperatures and tensile strengths than polypropylene. They are light in weight, resistant to staining, and have low moisture absorption rates.
High Density Polyethylene (HDPE)
Representing the largest portion of the polyethylene applications, HDPE offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. HDPE is also non-toxic and non-staining and meets FDA and USDA certification for food processing. |
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| TYPICAL PROPERTIES OF POLYETHYLENE |
| PHYSICAL |
| ASTM or UL test |
Property |
HDPE |
| D792 |
Density (lb/in3)
(g/cm3) |
0.0353
0.953 |
| D570 |
Water Absorption, 24 hrs (%) |
0 |
| MECHANICAL |
| D638 |
Tensile Strength (psi) |
4,600 |
| D638 |
Tensile Modulus (psi) |
- |
| D638 |
Tensile Elongation at Yield (%) |
900 |
| D790 |
Flexural Strength (psi) |
- |
| D790 |
Flexural Modulus (psi) |
200,000 |
| D695 |
Compressive Strength (psi) |
- |
| D695 |
Compressive Modulus (psi) |
- |
| D785 |
Hardness, Shore D |
D69 |
| D256 |
IZOD Notched Impact (ft-lb/in) |
3 |
| THERMAL |
| D696 |
Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F) |
- |
| D648 |
Heat Deflection Temp (°F/°C)
at 66 psi
at 264 psi |
-
- |
| D3418 |
Melting Temp (°F/°C) |
- |
| - |
Max Operating Temp (°F/°C) |
180/82 |
| C177 |
Thermal Conductivity
(BTU-in/ft2-hr-°F)
(x 10-4 cal/cm-sec-°C) |
-3
-3 |
| UL94 |
Flammability Rating |
n.r. |
| ELECTRICAL |
| D149 |
Dielectric Strength (V/mil) short time, 1/8” thick |
- |
| D150 |
Dielectric Constant at 50 kHz |
- |
| D150 |
Dissipation Factor at 50 kHz |
- |
| D257 |
Volume Resistivity (ohm-cm) at 50% RH |
- |
| D495 |
Arc Resistance (sec) |
- |
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Note: 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.
All values a 73°F (23°C) unless otherwise noted.
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