LLDPE ( Linear low density polyethylene )



Linear low density polyethylene (LLDPE) is a substantially linear polymer, with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins.

LLDPE has higher tensile strength and higher impact and puncture resistance than LDPE. It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It has good resistance to chemicals and to ultraviolet radiation. It has good electrical properties. However it is not as easy to process as LDPE, has lower gloss, and narrower range for heat sealing.

It is used for plastic bags and sheets (where it allows using lower thickness than comparable LDPE), plastic wrap, pouches, toys, lids, pipes, buckets and containers, covering of cables, geomembranes, and mainly for flexible tubing.

LLDPE manufactured using metallocene catalysts is labeled mLLDPE.

Physical Properties
Property Value
Density 0.92 g/cm
Surface hardness SD48
Tensile strength 20 MPa
Flexural modulus 0.35 GPa
Notched izod 1.06+ kJ/m
Linear expansion 2010−5/C
Elongation at break 500%
Strain at yield 20%
Max. operating temp. 50 C
Water absorption 0.01%
Oxygen index 17%
Flammability UL94 HB
Volume resistivity log(16) Ωcm
Dielectric strength 25 MV/m
Dissipation factor 1kHz 909090
Dielectric constant 1kHz 2.3
HDT @ 0.45 MPa 45 C
HDT @ 1.80 MPa 37 C
Material drying NA
Melting Temp. Range 120 to 160 C
Mould Shrinkage 3%
Mould temp. range 20 to 60 C