Polystyrene - PS Structural Foam

Sep 4 2001

Polymer Type

Thermoplastic

Advantages

Rigid parts of low weight possible, i.e. for the same rigidity, a foam of half the density of a solid needs only a 25% greater wall thickness. Thick mouldings can be produced without sink marks. Mouldings have low tendency to warp and have low residual stress.

Disadvantages

Not all grades are suitable for food contact or medical applications. High quality finish not producible with low pressure injection systems. Reduced tensile strength, HDT and dielectric strength compared with unmodified polystyrene.

Typical Properties

Property

Value

Density (g/cm3)

0.80

Surface Hardness

RM30

Tensile Strength (MPa)

22

Flexural Modulus (GPa)

1.6

Notched Izod (kJ/m)

0.03

Linear Expansion  (/°C x 10-5)

10

Elongation at Break (%)

2

Strain at Yield (%)

1.3

Max. Operating Temp. (°C)

50

Water Absorption (%)

0.07

Oxygen Index (%)

18

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

16

Dielectric Strength (MV/m)

10

Dissipation Factor 1kHz

0.0005

Dielectric Constant  1kHz

3

HDT @ 0.45 MPa (°C)

80

HDT @ 1.80 MPa (°C)

70

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

200 - 250

Mould Shrinkage (%)

0.6

Mould Temp. Range (°C)

20 -  50

Applications

Electronic and business machines. Replacement for wood furniture, television cabinets, armchair shells, armrests. Packaging cases.

 

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

 

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