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Low Density Polyethylene

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LDPE
ldpe_sheets-xl
2014-12-03-15.19.36
  • Description
  • Sizes
  • Tech Data

Low-Density Polyethylene (LDPE) LDPE is characterized by toughness and flexibility, relatively low heat resistance, low-temperature impact resistance, and clarity in film form. Like all polyethylene grades, LDPE has good resistance to chemical attack. At room temperature, it is insoluble in most organic solvents but is attacked by strong oxidizing acids. At higher temperatures, it becomes increasingly more susceptible to attack by aromatic, chlorinated and aliphatic hydrocarbons.

Polyethylene materials are divided into categories based on their specific gravity:

(a) low density polyethylene having specific gravity of 0.910 — 0.925,
(b) medium density polyethylene, specific gravity of 0.926 — 0.940, and
(c) high density (linear) polyethylene, specific gravity 0.941 — 0.965. 

The major advantages of polyethylenes are light weight, excellent chemical resistance, low moisture absorption, good impact strength, excellent low temperature properties, superb dielectric properties and low coefficient of friction. Unmodified polyethylenes can be produced from resins which are approved for food applications.

Increases in density result in: improved chemical resistance, greater hardness and tensile strength, better gas barrier properties, greater creep and temperature resistance.

Polyethylenes can be shaped and formed by standard heat forming techniques. If polyethylene is heated to within 5°C of its melting point, it can be shaped easily and will retain its imposed form on cooling. High density polyethylene for instance should be heated to a range of 130°C — 135°C for forming.

Polyethylenes can be readily welded with hot air. However, since oxygen at high temperatures has a tendency to degrade these materials, inert gas such as nitrogen should be used to weld this material.

LDPE is available in 48" wide rollstock in .030 and .060 thickness and 1/8", 3/16", 1/4", 1/2"  thickness in 4' X 8' Sheets

Roll Stock 48" wide  .060, .030

Sheet Stock 48" x 96"  - 1/8, 3/16, 1/4, 1/2" thicknesses

 

PROPERTIES TYPICAL APPLICATIONS
  • Corrosion resistant.
  • Lightweight.
  • Good impact resistance.
  • Extremely flexible.
  • Easily cleaned.
  • Weldable.
  • Vacuum formed parts
  • Fabricated parts
  • Prosthetic devices
  • Water treatment parts
  • Steel pickling
  • Food processing

 

PropertyValue
Density 0.95 g/cm³
Surface hardness SD48
Tensile strength 20 MPa
Flexural modulus 0.35 GPa
Notched izod 1.06+ kJ/m
Linear expansion 20×10−5/°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 1016 Ω·cm
Dielectric strength 25 MV/m
Dissipation factor 1 kHz 909090
Dielectric constant 1 kHz 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 22 to 60 °C