LDPE (LOW DENSITY POLYETHYLENE)

LDPE (LOW DENSITY POLYETHYLENE)

Material Information

LDPE is a thermoplastic that belongs to the polyolefin group of materials. LDPE is an extruded material that is characterized by good flexibility and resilience, good corrosion resistance and low moisture permeability, low heat resistance, low-temperature impact resistance, and clarity when in film form. At room temperature, LDPE is attacked by strong oxidizing acids, but is insoluble in most organic solvents. When exposed to certain chemicals or ultraviolet light, LDPE is susceptible to stress cracking, which is accelerated by wetting agents. LDPE is ideally used for applications that require strong corrosion resistance, but stiffness, operation at high temperatures, and structural strength are not important. LDPE is available in sheet, film, and rod.

Application

  • Packaging
  • Orthopedic products
  • Bags
  • Bottles
  • Liners
  • Toys
  • Hot-melt adhesives
  • Housewares
  • Wire insulation
  • Agricultural tanks
  • Chemical shipping containers
  • Battery jars
  • Medical equipment
  • Prosthetic appliances

Properties

  • Highly flexible
  • Good corrosion resistance
  • Low moisture permeability
  • Low heat resistance
  • Low – temperature impact resistance
  • Clarity (in film form)
  • Good resistance to chemical attack

Physical

Astm Test Method

LDPE

Density (lb/in^3) D792 0.033
Specific Gravity D792 0.92
Water Absorption @ 24 hours (%) D570  -

Mechanical

Tensile Strength (PSI) D638 1,800 – 2,200
Tensile Modulus (PSI) D638 -
Tensile Elongation at Yield (%) D638 600
Flexural Strength (PSI) D790 -
Flexural Modulus (PSI) D790 -
Izod Impact (Notched), ft-lb/in D256 No Break
Shore D Hardness D785 D41 – D50

Thermal

Coefficient of Thermal
Expansion, 10^-5/°F
D696 3
Heat Deflection Temperature 264 psi, ºF D648 120
Melting Point, °F D3418 230
Continous Service Temp (Operating), °F  - 160
Flammability Rating UL94 HB

Electrical

Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 460-700
Arc Resistance (sec) D495 135-160
Volume Resistivity (ohm-cm) @ 50% RH D257 10^15
Dielectric Constant at 1 kHz D150 2.25-2.30
Dissipation Factor at 1 kHz D150 0.0002

NOTE:

The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.