Ldpe material properties, low density polyethyelene, ldpe material properties and more on Plastixportal

Low Density Polyethylene Material Properties

Ldpe material properties, low density polyethyelene, ldpe material properties on Plastixportal

Properties

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Low Density Polyethylene - LDPE

Low-density polyethylene, LDPE is a thermoplastic made from petroleum. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. Its manufacture employs the same method today. LDPE is commonly recycled and has the number 4 as its recycling symbol. Despite competition from more modern polymers, LDPE continues to be an important plastic grade.

(LDPE) Low Density Polyethylene

Polymer Type

Thermoplastic

Advantages of LDPE

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 of LDPE

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

Applications of LDPE

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 of LDPE

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 1kHz

0.0003

Dielectric Constant  1kHz

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

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