Low Density Polyethylene - LDPE

Polymer Type

Thermoplastic

Advantages

Cheap, good chemical resistance.  High impact strength at low temperatures.  Excellent electrical properties.  Can be processed by all conventional methods.  Can be transparent in thin film form.

Disadvantages

Low strength, stiffness and maximum operating temperature.  Flammable.  Poor UV resistance.  High gas permeability ( particularly CO2 ).  Susceptible to environmental stress cracking.

Applications

Chemically resistant fittings, bowls, lids, gaskets, toys, containers, packaging film, film liners, squeeze bottles.  Heat-seal films for metal laminates.  Pipe, cable covering, core in UHF cables.

Typical Properties

Property Value
Density (g/cm3) 0.92
Surface Hardness SD48
Tensile Strength (MPa) 10
Flexural Modulus (GPa) 0.25
Notched Izod (kJ/m) 1.06+
Linear Expansion (/°C x 10-5) 20
Elongation at Break (%) 400
Strain at Yield (%) 19
Max. Operating Temp. (°C) 50
Water Absorption (%) 0.01
Oxygen Index (%) 17
Flammability UL94 HB
Volume Resistivity (log ohm.cm) 16
Dielectric Strength (MV/m) 27
Dissipation Factor 1 kHz 0.0003
Dielectric Constant 1 kHz 2.3
HDT @ 0.45 MPa (°C) 50
HDT @ 1.80 MPa (°C) 35
Material. Drying hrs @ (°C) NA
Melting Temp. Range (°C) 220 - 260
Mould Shrinkage (%) 3
Mould Temp. Range (°C) 20 - 40

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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