Polystyrene (PS)
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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
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
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
**************************************
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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