LDPE
LDPEis the oldest and most mature of the polyethylenes (PE). It is characterised by its short and long chain branching which gives it good clarity and processability although it does not have the strength properties of the other PEs.
Low density polyethylene has good chemical resistance and electrical properties, but it has a high thermal expansion and tends to fail under mechanical and thermal stress.
Glass reinforcement improves its thermal expansion, strength, rigidity and temperature resistance. As with most other polymer systems, the increase in flexural modulus is related to the glass fiber content.
Tensile strength is increased with glass reinforcement, as is flexural strength
Advantages:
Low cost
Impact resistant from -40 C to 90 C
Moisture resistance
Good chemical resistance
Food grades available
Readily processed by all thermoplastic methods
LIMITATIONS:
High thermal expansion
Poor weathering resistance
Subject to stress cracking
Difficult to bond
Flammable
Poor temperature capability
TYPICAL APPLICATIONS:
(LDPE) is used mainly in film applications for both packaging and non-packaging applications. Other markets include extrusion coatings, sheathing in cables and injection molding applications.
Toys, utensils, films, bottles, pipe and processing equipment. Wire and cable insulations
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