Thermophysical Properties of High Density Polyethylene. HOME ; DISCLAIMER; High-Density Polyethylene (HDPE) Thermo-Physical Properties. PROPERTY: UNIT: VALUE / RANGE : Melting Point °C: 126 - 135: Density : g mL-1: 0.955 - 0.961: efficient of ... Dielectric Strength : V/mm x 10 4: 2.1 - 3.5: Dielectric nstant @ 1 MHz: n/a: 2.2 - 2.4 ...