What is LLDPE?

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Since the early 1990’s, linear low density polyethylene (LLDPE) has come to the fore in rotational  moulding applications, because of its outstanding  physical properties (excellent environmental stress  crack resistance and impact performance) and ease  of processing.

Linear Low Density Polyethylene (LLDPE) refers to low density type polymer with a density between about 0.915 and 0.930 g/cm3, made via an HDPE type manufacturing process. LLDPE is a linear molecule with a higher level of short chain branching than HDPE (specifically introduced by polymerisation with co-monomer), but without the long chain branches which characterise LDPE.

Linear polymers including Alkatuff LLDPE have a lower extensional viscosity and show a much reduced tendency to strain-harden. These differences have important implications in the processing behaviour of these polymers. The lower extensional viscosity means that LLDPE is much easier to draw down to thin gauges.  Because of its lower melt elasticity, LLDPE has much faster relaxation times and gives lower frozen-in orientation than LDPE. In general LLDPE is expected to give greater impact performance and a much superior environmental stress crack resistance than LDPE. In linear polyethylenes, the distribution and length of the side branches has a profound effect on the environmental stress crack resistance.

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