PE-LD: Polyethylene low density

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


Glass Transition Temperature
-130 to - 100/-30 to -10 °C
Melting Temperature
100 to 115 °C
Melting Enthalpy
- J/g
Decomposition Temperature
487 to 498 °C
Young's Modulus
200 to 400 MPa
Coefficient of Linear Thermal Expansion
400 *10¯6/K
Specific Heat Capacity
1.8 to 3.4 J/(g*K)
Thermal Conductivity
0.3 to 0.34 W/(m*K)
0.91 to 0.93 g/cm³
Semi-crystalline thermoplastic
General properties
Tough and elastic, good electric insulation, minimal moisture absorption, approved for food contact.
Extrusion (films, profiles), injection moulding, blow moulding, extrusion-coating.
Films(for a variety of applications), packaging (e.g. containers, plastic bags).

Internet Links

NETZSCH Measurements

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


A characteristic feature of this polymer is that the melting transition – as in the present case – can start very early (here at approx. 40°C). The peak temperatures of the endothermal melting effects are at 112/113°C (1st heating, blue and 2nd heating, green) and are therefore relatively high for PE-LD. The shoulder in the melting effect in the 1st heating (blue) is absent in the 2nd heating (green). It can be concluded from this observation that stresses in the material (thermomechanical history) were eliminated during the 1st heating.
The glass transition of polyethylene is generally small (small Δcp, i.e., changes in the specific heat level prior to and after the effect) and therefore sometimes hard to detect by DSC.

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