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Polyethylene - High density ( HDPE )

Material Information

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Film Granule Rod Sheet Tube
Film Granule Rod Sheet Tube

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Common Brand Names:
Hostalen HD, Lacqtene HD, Lupolen, Rigidex, Stamylan HD
 
General Description:  

See also General Information under Polyethylene - Low Density

General Description : A semi-crystalline (typically 70-80%) whitish, semi-opaque commodity thermoplastic with properties similar to LDPE but which is significantly stronger and stiffer and has even better chemical resistance. Its impact resistance is reasonably high, and is retained at low temperatures, though that of LDPE is much higher. Its electrical properties, particularly at high frequencies, are very good but LDPE's are even better. Its barrier properties, though indifferent, are better than those of LDPE.

Applications include a wide range of containers, blown bottles for food, pipe and pipe fittings and packaging films.

   

Chemical Resistance

Acids - concentrated Good-Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair
Greases and Oils Good-Fair
Halogenated Hydrocarbons Fair-Poor
Halogens Fair-Poor
Ketones Good-Fair

Electrical Properties

Dielectric constant @1MHz 2.3-2.4
Dielectric strength ( kV mm-1 ) 22
Dissipation factor @ 1MHz 1-10 x 10-4
Surface resistivity ( Ohm/sq ) 1013
Volume resistivity ( Ohmcm ) 1015-1018

Mechanical Properties

Coefficient of friction 0.29
Hardness - Rockwell D60-73 - Shore
Izod impact strength ( J m-1 ) 20-210
Poisson's ratio 0.46
Tensile modulus ( GPa ) 0.5-1.2
Tensile strength ( MPa ) 15-40

Physical Properties

Density ( g cm-3 ) 0.95
Flammability HB
Limiting oxygen index ( % ) 17
Radiation resistance Fair
Refractive index 1.54
Resistance to Ultra-violet Poor
Water absorption - over 24 hours ( % ) <0.01

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 100-200
Heat-deflection temperature - 0.45MPa ( C ) 75
Heat-deflection temperature - 1.8MPa ( C ) 46
Specific heat ( J K-1 kg-1 ) 1900
Thermal conductivity @23C ( W m-1 K-1 ) 0.45-0.52
Upper working temperature ( C ) 55-120

Properties for Polyethylene - High density Film

Property Value
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.3/2
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 2
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.1
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.4
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 10
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 40

Properties for Polyethylene - High density Tube

Property Value
Material Biaxially oriented tube
Relative Impact Strength 2-3
Tensile modulus - Longitudinal GPa 1-1.2
Tensile modulus - Transverse GPa 0.8 - hoop
Tensile strength - Longitudinal MPa 70-100
Tensile strength - Transverse MPa 35-40 - hoop

Buy Polyethylene - High density on-line

Standard products are available in these forms
Film Granule Rod Sheet Tube
Film Granule Rod Sheet Tube

Choose a form to search our on-line catalogue  

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