Polyethylene (HDPE / LDPE)
Polyethylene is the most widely used thermoplastic polymer today. It is available in a variety of grades and formulations to suit different needs. In general, polyethylenes offer excellent chemical and impact resistance, electrical properties and low coefficient of friction. In addition, polyethylenes are lightweight, easily processed and offer near-zero moisture absorption.
There are four categories of polyethylene based on density/property: low, medium, high (HDPE) and ultra-high molecular weight polyethylene.
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|Density||952 - 965||kg/m^3||00.344 - 0.0349||lb/ft^3|
|Yield Strength||2.62e7 - 3.1e7||Pa||3.8 - 4.5||ksi|
|Tensile Strength||2.21e7 - 3.1e7||Pa||3.21 - 4.5||ksi|
|Elongation||11.2 - 12.9||% strain||1.12e3 - 1.29e3||% strain|
|Hardness (Vickers)||7.75e7 - 9.71e7||Pa||7.9 - 9.9||HV|
|Impact Strength (unnotched)||1.9e5 - 2e5||J/m^2||90.4 - 95.2||ft.lbf/in^2|
|Fracture Toughness||1.52e6 - 1.82e6||Pa/m^0.5||1.38 - 1.66||ksi/in^0.5|
|Young's Modulus||1.07e9 - 1.09e9||Pa||0.155 - 0.158||10^6 psi|
|Max Service Temperature||113 - 129||°C||235 - 264||°F|
|Melting Temperature||130 - 137||°C||266 - 279||°F|
|Insulator or Conductor||Insulator||Insulator|
|Specific Heat Capability||1.75e3 - 1.81e3||J/kg °C||0.418 - 0.432||BTU/lb. °F|
|Thermal Expansion Coefficent||1.06e-4 - 1.98e-4||strain/°C||59 - 110||µstrain/°F|
|CO2 Footprint||1.95 - 2.15||kg/kg||1.95 - 2.15||lb/lb|
∗ The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.
Posting Date: July 30, 2012