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      Polyethylene terephthalate ( Polyester, PET, PETP )

      Material Information

      Buy Polyethylene terephthalate on-line

      We stock and supply the following standard forms:
      Fibre Film Granule Laminate Mesh Metallised Film Monofilament Powder Rod
      Fibre Film Granule Laminate Mesh Metallised Film Monofilament Powder Rod
      Sheet
      Sheet

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      Common Brand Names:
      Arnite, Dacron, Hostaphan, Impet, Melinar, Melinex, Mylar, Rynite, Terylene, Trevira
       
      General Description:  

      General Description: The most common thermoplastic polyester, this polymer is often called just "polyester". This often causes confusion - not only is the chemically similar PBT also a (thermoplastic) polyester, the most common resin system used in GRP is also a polyester system - and also often called just "polyester". (In this latter case, however, the polyesters are chemically unsaturated and are "free-radical polymerised" into a thermoset).

      PET is a hard, stiff, strong, dimensionally stable material that absorbs very little water. It has good gas barrier properties and good chemical resistance except to alkalis (which hydrolyse it). Its crystallinity varies from amorphous to fairly high crystalline; it can be highly transparent and colourless but thicker sections are usually opaque and off-white.

      It is widely known in the form of biaxially oriented and thermally stabilised films usually referred to by their main brand names Mylar, Melinex or Hostaphan. Strictly speaking, these names should be used only for this type of film whose properties are different from, and in several respects superior to, those of "ordinary" PET film.

      These "Mylar®-type" films are used for capacitators, graphics, film base and recording tapes etc. PET is also used for fibres for a very wide range of textile and industrial uses (Dacron®, Trevira®, Terylene®). Other applications include bottles and electrical components.

         

      Chemical Resistance

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

      Electrical Properties

      Dielectric constant @1MHz 3.0
      Dielectric strength ( kV mm-1 ) 17
      Dissipation factor @ 1kHz 0.002
      Surface resistivity ( Ohm/sq ) 1013
      Volume resistivity ( Ohmcm ) >1014

      Mechanical Properties

      Coefficient of friction 0.2-0.4
      Hardness - Rockwell M94-101
      Izod impact strength ( J m-1 ) 13-35
      Poisson's ratio 0.37-0.44(oriented)
      Tensile modulus ( GPa ) 2-4
      Tensile strength ( MPa ) 80, for biax film 190-260

      Physical Properties

      Density ( g cm-3 ) 1.3-1.4
      Flammability HB
      Limiting oxygen index ( % ) 21
      Radiation resistance Good
      Refractive index 1.58-1.64
      Resistance to Ultra-violet Fair?
      Water absorption - equilibrium ( % ) <0.7
      Water absorption - over 24 hours ( % ) 0.1

      Thermal Properties

      Coefficient of thermal expansion ( x10-6 K-1 ) 20-80
      Heat-deflection temperature - 0.45MPa ( C ) 115
      Heat-deflection temperature - 1.8MPa ( C ) 80
      Lower working temperature ( C ) -40 to -60
      Specific heat ( J K-1 kg-1 ) 1200 - 1350
      Thermal conductivity @23C ( W m-1 K-1 ) 0.15-0.4
      Upper working temperature ( C ) 115-170

      Properties for Polyethylene terephthalate Chopped Fibre

      Property Value
      Material Medium High tenacity
      Density g cm-3 1.39 1.39
      Extension to break % 36 13-16
      Modulus GPa 9-11
      Specific Modulus cN/tex 700-800
      Shrinkage @100C % 4 1.5-6
      Specific Tenacity cN/tex 36 70-80

      Properties for Polyethylene terephthalate Fibre

      Property Value
      Material Medium High tenacity
      Density g cm-3 1.39 1.39
      Extension to break % 36 13-16
      Modulus GPa 9-11
      Specific Modulus cN/tex 700-800
      Shrinkage @100C % 4 1.5-6
      Specific Tenacity cN/tex 36 70-80

      Properties for Polyethylene terephthalate Film

      Property Value
      Dielectric Strength @25µm thick kV mm-1 300
      Dissipation Factor @1MHz 0.016
      Elongation at Break % 60-165
      Initial Tear Strength g µm-1 18-54
      Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.2
      Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.4
      Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.004
      Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.03
      Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 100
      Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 150
      Specific Heat kJ kg-1 K-1 1.3
      Thermal Conductivity @23C W m-1 K-1 0.13-0.15

      Buy Polyethylene terephthalate on-line

      We stock and supply the following standard forms:
      Fibre Film Granule Laminate Mesh Metallised Film Monofilament Powder Rod
      Fibre Film Granule Laminate Mesh Metallised Film Monofilament Powder Rod
      Sheet
      Sheet

      Choose a form to search our on-line catalogue  

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