Properties 

Polystyrene  (PS)

Topics   Index

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Copyright 2002 by Roger D. Corneliussen
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Values are from Modern Plastics Encyclopedia 99.

To jump to a particular property, click on the name below.

Melt Flow
Melting Temperature
Glass Transition
Processing Molding Pressure
Processing Molding Temperature
Compression Ratio
Mold Shrinkage
Tensile Strength
Elongation
Tensile Yield Strength
Compressive Strength
Flexural Strength
Tensile Modulus
Flexural Modulus
Izod Impact Strength
Hardness
Deflection Temperature
Thermal Expansion
Thermal Conductivity
Specific Gravity
Dielectric Strength
Water Absorption

Melt Flow ASTM D1238 (gm/10 min)
--- gm /10 min

Melting Temperature  degrees C
Tm Crystalline
--- C

Glass Transition (C)
Tg (Amorphous)

74 to 105 C

Processing Temperature Range Degrees F
Extrusion

300 to 400 for compression molding
350 to 500 F for injection molding
350 to 500 F for extrusion

Molding Pressure Range ( PSI) (ksi)
5 000 to 20 000 psi
5 to 20 ksi

Compression Ratio
3

Mold(Linear) Shrinkage (in/in)
ASTM D955

0.004 to 0.007

Tensile Strength at Break
ASTM D638
5200 to 7500 psi

Elongation at break (%)
ASTM D638
1.2 to 2.5 %

Tensile Yield Strength (psi)
ASTM D638
--- psi

Compressive Strength (psi)
Rupture or Yield
ASTM D695
12 000 to 13 000  psi

Flexural Strength (psi)
Rupture or Yield
ASTM D790
10 000 to 14 600  psi

 Tensile Modulus (psi)
ASTM D638
330 000 to 475 000 psi

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
480 000 to 490 000 psi

To go to Modulus Values,
click on
Modulus

Flexural Modulus (psi)
ASTM D790
At 73 F
380 000 to 490 000 psi
At 200 F
--- psi
At 250 F
--- psi

To go to Modulus Values,
click on
Modulus

Izod Impact (ft-lb/in of notch)
ASTM D256A

0.35 to 0.45 ft lb/in of notch

Hardness
Rockwell ASTM D785
M60 - 
75
Shore D66 ASTM D2240/D2583
--

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
50 to 83 (10 x exp 6) in/in /C
0.000 050 to 0.000 083 in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
169 to 202 F
66 psi  ---
155 to 204 F

Thermal Conductivity
(10 x exp 4)al cm/sec cm2 C
ASTM C177
3.0 (10 x exp 4) cal cm/sec cm2
0.0003  cal cm/sec cm2

Specific Gravity
ASTM D792
1.04 to 1.05

To go to Density /Specific Gravity Values,
click on
Density

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 
0.01 to 0.03 %
Saturation 
0.01 to 0.03  %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
500 to 575 v/mil

Topics   Index

**************************************
Copyright 2002 by Roger D. Corneliussen
No part of this transmission is to be
duplicated, in any manor, or forwarded by
electronic mail without the express written
permission of Roger D. Corneliussen
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