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Strength: Exhibits higher Tensile, Impact strength and Puncture resistance versus
conventional LDPE, improved flex life, low warpage, improved stress-crack
resistance and lower thickness films can be blown
Limitations: high mould shrinkage, narrower heat seal temperature range and
difficult to process than LDPE
Applications: Bags and pouches, films and liners, Pipes & Fittings, Wiring &
Cables, Water pipes, Cable jacketing, Cable insulators, overhead tanks,
3) Very Low Density Polyethylene (VLDPE):
has densities between 0.890 and 0.915 Applications include disposable gloves,
shrink packages, vacuum cleaner hoses, tuning, bottles, shrink wrap, diaper film
liners, and other health care products
4) High Density Polyethylene (HDPE):
It has minimal branching of its' polymer chains and thus stronger intermolecular
forces. It is more rigid, opaque and has higher tensile strength then LDPE, LLDPE.
Density 0.941- 0.965 g/cm 3
Melting Temperature 130 -137 °C
Glass transition temperature -110 °C
Max / Min continuous Service temperature 70 - 80 °C / - 70 °C
Processing Temperature 190 - 280 °C
Strength: Good processablity, excellent chemical resistance and Electrical
insulation properties
Limitations: Stress Cracking susceptible, high mould shrinkage, poor UV light
resistance, Low stiffness than PP
Application: Packaging Films, bags, Agriculture films, Pipes and hoses,
Geotextiles, bottles and containers, cans, caps and closures, household plastic
products, Large drums, crates, gas pipes, crates, woven sacks, auto fuel tanks,
Orthotics and prosthetics others.
5) Medium Density Polyethylene (MDPE):
It has a little less branching then the HDPE. It is less notch sensitive then HDPE and
has better stress cracking resistance. It has a density range of 0.926 - 0.940 g/cm 3
6) Cross-linked Polyethylene (XLPE):
XLPE is high density polyethylene which has covalent bonds connecting its
polymer chains thus forming 3-dimensional polymers with high molecular weights.
The cross linking is achieved generally by addition of small amounts of organic
peroxides, provides superior stress cracking, improved toughness, stiffness,
chemical and heat resistance, good low temperature resistance and insulating
properties compared to the HDPE.
Density 0.915 -1.4 g/cm 3
Max continuous Service temperature 110 - 130 °C
Processing Temperature ~ 190°C
Processed generally by Extrusion process and also Rotational Moulding
Applications: Extruded products like Pipes, Films (shrink wrap film in particular),
Electrical wire and cable insulation

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