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Polystyrene ( PS )

Material Information

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We stock and supply the following standard forms:
Film Granule Powder Sheet
Film Granule Powder Sheet

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Common Brand Names:
Polystyrol, Styron
 
General Description:  

General Description : Polystyrene homopolymer, known as "crystal" polystyrene in the trade, is an amorphous, transparent and colorless commodity thermoplastic that is rigid, relatively hard and brittle. It has good electrical properties, excellent gamma radiation resistance and can be radiation sterilized but has poor chemical and UV resistance. When modified by the incorporation of elastomers, it becomes (high) impact polystyrene or HIPS, which is opaque. Hence there are a large number of polystyrene grades available commercially.

Applications include housewares, containers, packaging, glazing and light diffusers and, for HIPS, casings, cups, take-out containers and cassette cases. Polystyrene is also widely used as structural foam and expanded into beads for packaging and cushioning.

   

Chemical Resistance

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

Electrical Properties

Dielectric constant @1MHz 2.4-3.1
Dielectric strength ( kV mm-1 ) 20
Dissipation factor @ 1kHz 0.0002
Volume resistivity ( Ohmcm ) >1016

Mechanical Properties

Elongation at break ( % ) 1.6
Hardness - Rockwell M60-90
Izod impact strength ( J m-1 ) 19-24
Poisson's ratio 0.35
Tensile modulus ( GPa ) 2.3-4.1
Tensile strength ( MPa ) 30-100

Physical Properties

Abbe number 30.8
Density ( g cm-3 ) 1.05
Flammability HB
Limiting oxygen index ( % ) 19
Radiation resistance Good
Refractive index 1.59-1.60
Resistance to Ultra-violet Poor
Water absorption - over 24 hours ( % ) <0.4

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 30-210
Heat-deflection temperature - 0.45MPa ( C ) 90
Heat-deflection temperature - 1.8MPa ( C ) 80
Specific heat ( J K-1 kg-1 ) 1200
Thermal conductivity @23C ( W m-1 K-1 ) 0.1-0.13
Upper working temperature ( C ) 50-95

Properties for Polystyrene Film

Property Value
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 8
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 17 (biax)
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.6 (biax)
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 2 (biax)
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 800 (biax)
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 800
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Polystyrene on-line

We stock and supply the following standard forms:
Film Granule Powder Sheet
Film Granule Powder Sheet

Choose a form to search our on-line catalog  

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