Lldpe material properties and more information on Plastixportal

Linear Low Density Polyethylene

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Linear Low Density Polyethylene

LLDPE is defined by a density range of 0.915–0.925 g/cm3. LLDPE is a substantially linear polymer with significant numbers of short branches, commonly made by copolymerization of ethylene with short-chain alpha-olefins (for example, 1-butene, 1-hexene and 1-octene). LLDPE has higher tensile strength than LDPE, it exhibits higher impact and puncture resistance than LDPE. Lower thickness (gauge) films can be blown, compared with LDPE, with better environmental stress cracking resistance but is not as easy to process. LLDPE is used in packaging, particularly film for bags and sheets.

Polymer Type

Thermoplastic

Advantages of LLDPE

Has higher tensile strength than LDPE.  Exhibits higher impact and puncture resistance than LDPE.  Lower thickness (gauge) films can be blown compared to LDPE, with better environmental stress cracking resistance compared to LDPE.

Disadvantages of LLDPE

Lower gloss than LDPE.  Narrower temperature range for heat sealing. Not as easy to process as LDPE.

Applications of LLDPE

Plastic Packaging - packaging film, plastic bags and flexible plastic sheets. Lower thickness (gauge) may be used compared to LDPE. Cable covering, toys, lids, buckets and containers, pipe.

Typical Properties of LLDPE

Property

Value

Density (g/cm3)

0.92

Surface Hardness

SD48

Tensile Strength (MPa)

20

Flexural Modulus (GPa)

0.35

Notched Izod (kJ/m)

1.06+

Linear Expansion  (/°C x 10 5)

20

Elongation at Break (%)

500

Strain at Yield (%)

20

Max. Operating Temp. (°C)

50

Water Absorption (%)

0.01

Oxygen Index (%)

17

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

16

Dielectric Strength (MV/m)

25

Dissipation Factor 1kHz

0.0003

Dielectric Constant  1kHz

2.3

HDT @ 0.45 MPa (°C)

45

HDT @ 1.80 MPa (°C)

37

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

220 - 260

Mould Shrinkage (%)

3

Mould Temp. Range (°C)

20 -  60

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