PE-HD: Polyethylene high density

Short Name
Polyethylene high density
CTP - Commodity Thermoplastics
General Properties
Chemical Formula
Structural Formula


Glass Transition Temperature
-130 to -100 °C
Melting Temperature
125 to 135 °C
Melting Enthalpy
293 J/g
Decomposition Temperature
480 to 498 °C
Young's Modulus
600 to 1400 MPa
Coefficient of Linear Thermal Expansion
200 to 250 *10¯6/K
Specific Heat Capacity
1.8 to 2.7 J/(g*K)
Thermal Conductivity
0.33 to 0.53 W/(m*K)
0.94 to 0.96 g/cm³
Semi-crystalline thermoplastic
General properties
Better chemical reistance compared to PE-LD, good electrical insulating properties.
Extrusion (foils, profiles), Blow moulding, extrusion (foils, profiles), deep-drawing, injection moulding.
Films (for different applications), packaging for household and industry (e.g. bottles, plastic bags, beverage bottles caps), gas and water pipes, cable lines.

Internet Links

NETZSCH Measurements

DSC 204 F1 Phoenix®
Sample Mass
10.49 mg
Isothermal Phase
20 min/2 min/20 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (40 ml/min)


Although PE-HD belongs to the semi-crystalline thermoplastics, the measurement curves reflect only a melting effect with a peak temperature of approx. 133°C and a melting enthalpy of approx. 201 J/g (2nd heating, green). A glass transition range would have been expected between -130°C and -100°C; however, the specific heat hanges are probably too small to be detected in this case.
PE-LD and PE-HD differ significantly in their melting temperature. While the low density polyethylene (PE-LD) on page 69 has a peak temperature of 112°C in the 2nd heating (green), the above example for high-density polyethylene (PE-HD) has a peak temperature of 133°C. Linear low-density polyethylene (PE-LLD) shows a melting effect with characteristic double peak structure (see page 71), with a main peak temperature (approx. 124°C) that lies between the two previously mentioned values.

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