Properties of High Density Polyethylene (HDPE)
High-Density Polyethylene (HDPE) is a versatile thermoplastic polymer derived from petroleum, valued for its high strength-to-density ratio and chemical resistance. Commonly used in packaging, piping, and industrial applications, HDPE offers a reliable balance of performance and durability.
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The following table provides a comprehensive list of high density polyethylene (HDPE) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Category | Thermoplastic |
| Density | 950 - 968 kg/m3 |
| Water Absorption | 0.01 %wt/day |
| Mechanical Properties | Metric |
| Ultimate Tensile Strength | 16 - 40 MPa |
| Yield Tensile Strength | 25 - 40 MPa |
| Young’s Modulus (E) | 0.41 - 1.24 GPa |
| Flexural Modulus | 0.062 - 0.105 GPa |
| Elongation at Break | 5 - 12% |
| Shore Hardness (D) | 60 - 73 |
| Static Friction Coefficient (µ) | 0.29 |
| Thermal Properties | Metric |
| Melting Point | 125 - 137 °C |
| Thermal Conductivity | 0.42 - 0.52 W/m·K |
| Specific Heat Capacity (Cp) | 1900 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 10-4 - 2×10-4 1/°C |
| Glass Transition Temperature (Tg) | -200 to -90 °C |
| Electrical Properties | Metric |
| Relative Permittivity (@1 MHz) (εr) | 2.30 - 2.40 |
| Electrical Resistivity | 1015 Ω·cm |
| Dielectric Field Strength (Ed) | 420 - 520 kV/cm |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.53 - 1.54 |
| Hazardous Data | Metric |
| Flammability Rating (ANSI/UL 94) | Combustible |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)