PE-LLD: Polyethylene linear low density

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


Glass Transition Temperature
-130 to -100 / -70 to -25 °C
Melting Temperature
122 to 127 °C
Melting Enthalpy
- J/g
Decomposition Temperature
475 to 485 °C
Young's Modulus
250 to 700 MPa
Coefficient of Linear Thermal Expansion
200 *10¯6/K
Specific Heat Capacity
- J/(g*K)
Thermal Conductivity
- W/(m*K)
0.91 to 0.94 g/cm³
Semi-crystalline thermoplastic
General properties
Balanced relationship of toughness and stiffness, good chemical resistance, good electrical insulating properties.
Extrusion (films, profiles), injection moulding, blow moulding, extrusion-coating.
Films (allows for lower film thickness than PE-LD), mainly in household and agriculture, packaging (e.g. containers and plastic bags), toys.

Internet Links

NETZSCH Measurements

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


The 1st heating (blue) exhibits a highly structured melting endotherm with a main peak (at 119°C) and several upstream and downstream shoulders, reflecting the presence of stresses (thermomechanical history).
In the 2nd heating (green), two peaks at approx. 112°C and 124°C remained. Due to side chain branching, different melting phases are formed which melt one after the other. The corresponding melting enthalpy in the 2nd heating amounts to approx. 137 J/g. Since PE-LLD is a semi-crystalline thermoplastic, the glass transition observed at -35°C (for both heatings) can be related to the amorphous component of the polymer.
A second possible glass transition at approx. -100°C to -130°C, which could be due to the different crystallite structures, is not viewable in the plots shown.

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