UHMW (ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE)

UHMW (ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE)

Material Information

UHMW is a thermoplastic that belongs to the polyolefin group of material. Molecular density characterizes polyethylene, with UHMW being the most dense with a molecular weight of 3.1 million or higher. UHMW is simple to machine. UHMW is light weight, has no moisture absorption, has high tensile and impact strength, is shatter resistant, is long wearing, abrasion and corrosion resistant, is self-lubricating, and has excellent chemical resistance. This makes it ideal for wear parts in machinery and equipment as well as linings in material handling systems or storage containers. It also meets FDA and USDA acceptance for food and pharmaceutical equipment. UHMW has a melting point of 267º F but recommended maximum service is about 180º F. It is available in plate, rod, angle, strip with or without adhesive, and pipe.

Application

  • Conveyer wear strips
  • Snowmobile track sprockets
  • Guide rails – food processing
  • Bearings and washers
  • Textile loom parts
  • Chute linings
  • Agriculture
  • Medical devices
  • Printing
  • Automotive and railroad
  • Material handling

Properties

  • Outstanding abrasion/corrosion resistance
  • Extremely low coefficient of friction
  • High impact strength (no break)
  • Excellent chemical resistance
  • Light weight
  • Self-lubricating
  • No moisture absorption
  • Excellent noise abatement
  • Maintains key physical properties to -30ºF
  • Floats in water

Physical

Astm Test Method

UHMW

Density (lb/in^3) D792 0.034
Specific Gravity D792 0.93
Water Absorption @ 24 hours (%) D570 0

Mechanical

Tensile Strength (PSI) D638 3,100
Tensile Modulus (PSI) D638 125,000
Tensile Elongation at Yield (%) D638 -
Flexural Strength (PSI) D790 -
Flexural Modulus (PSI) D790 125,000
Compressive Strength D695 2,000
Izod Impact (Notched), ft-lb/in D256 No Break
Shore D Hardness D785 D62-D66

Thermal

Coefficient of Thermal
Expansion, 10^-5/°F
D696 11
Heat Deflection Temperature 264 psi, ºF D648 203
Melting Point, °F D3418 280
Continous Service Temp (Operating), °F  - 180
Thermal Conductivity, BTU-in/hr-ft² °F C177 2.92
Flammability Rating UL94 HB

Electrical

Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 900
Arc Resistance (sec) D495 250-350
Volume Resistivity (ohm-cm) @ 50% RH D257 10^18
Dielectric Constant at 1 kHz D150 2.30-2.35
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.