Properties 

High Impact Polystyrene
(HIPS)

Topics   Index

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Copyright 2002 by Roger D. Corneliussen
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To jump to a particular property, click on the name listed below.

From Modern Plastics Encyclopedia 99, p. B-198

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

Note: The ASTM numbers are linked to 
their descriptions on the ASTM website.  
To go to the description, simply
click on the ASTM number

Melt Flow 
ASTM D1238
(gm/10 min)

5.8 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
--- C

Glass Transition (C)
Tg (Amorphous)

93 to 105 C

Processing Temperature Range Degrees F
Extrusion

350 to 525 F for Injection Molding
375 to 500 F for Extrusion

Molding Pressure Range ( PSI) (ksi)
10000 to 20000 psi
10 to 20 ksi
67 to 133 MPa

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Compression Ratio
4

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.004 to 0.007 in/in 

Tensile Strength at Break
ASTM D638
1900 to 6200 psi
13 to 41 MPa

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Elongation at break (%)
ASTM D638
20 to 65 %

Tensile Yield Strength (psi)
ASTM D638
2100 to 6000 psi
14 to 40 MPa

Compressive Strength (psi)
Rupture or Yield
ASTM D695
--- psi
--- MPa

To go to Compressive Strength Values,
click on
Compressive Strength

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Flexural Strength (psi)
Rupture or Yield
ASTM D790
3300 to 10000 psi
22 to 67 MPa

Tensile Modulus (psi)
ASTM D638
160000 to370000 psi
1.1 to 2.5 GPa

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
--- psi
--- GPa

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Flexural Modulus (psi)
ASTM D790
At 73 F
160000 to 390000 psi
1.1 to 2.6 GPa
At 200 F
--- psi
--- GPa
At 250 F
--- psi
--- GPa
At 300 F
--- psi
--- GPa

Izod Impact (ft-lb/in of notch)
ASTM D256

0.95 to 7.0  ft lb/in of notch

To go to Izod Values,
click on
Izod

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Hardness
Rockwell ASTM D785
M50 to 82; L60
--
Shore D65 ASTM D2240/D2583
---

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
44.2 (10 x exp 6) in/in /C
0.000 044  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
170 to 205 F
66 psi  ---
165 to 200 F

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

Specific Gravity
ASTM D792
1.03 to 1.06

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

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.05 to 0.07 %
Saturation 
---  %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
--- v/mil

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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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