LLDPE

Polyethylene, Linear Low Density (LLDPE).

Linear Low Density Polyethylene (LLDPE) is produced in a low pressure reactor and incorporates either a butene, hexene or octene comonomer. By definition, LLDPE has a density range of 0.915 to 0.940 g/cm3. LLDPE is characterized by excellent puncture and tear resistance, especially compared to HDPE or LDPE as well as a good balance between stiffness and toughness. LLDPE is most commonly processed by injection molding and film extrusion. Typical applications for LLDPE include caps, closures and lids, pails, various types of films, and wire and cable compounds.

Polyethylene is classified by its density and branching. Its mechanical properties depend significantly on variables such as the extent and type of branching, the crystal structure, and the molecular weight.

There are several types of polyethylene:

1. High-Density Polyethylene (HDPE):

1. • HDPE is known for its large strength-to-density ratio. The density of HDPE can range from 0.93 to 0.97 g/cm³.
   • It is classified in five grades: Film, Injection, Blow, Extrusion, Roto.

2. Low-Density Polyethylene (LDPE):

1. • LDPE is defined by a density range of 0.910–0.940 g/cm³ and has more branching than HDPE.

3. Linear Low-Density Polyethylene (LLDPE):

1. • LLDPE differs structurally from conventional LDPE because of the absence of long chain branching.