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Polyethylene terephthalate ( Polyester, PET, PETP )

Material Information

Buy Polyethylene terephthalate on-line

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

Choose a form to search our on-line catalogue  

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