Polyimides /PI
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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 listed 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)
2.5 to 7.5 gm /10 min
Melting
Temperature degrees C
Tm Crystalline
388 C
Glass
Transition
(C)
Tg (Amorphous)
250 to 365 C
Processing
Temperature
Range Degrees F
Extrusion
734 to 740 F for injection molding
734 to 740 F for extrusion
625 to 690 F for compression molding
Molding
Pressure Range ( PSI) (ksi)
3000 to 20 000 psi
3 to 20 ksi
20 to 130 MPa
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Compression
Ratio
1.7 to 4.0
Mold(Linear)
Shrinkage (in/in)
ASTM D955
0.0083
Tensile
Strength at Break
ASTM D638
10 500 to 17 100 psi
70 to 110 MPa
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Elongation
at break (%)
ASTM D638
7.5 to 90 %
Tensile
Yield Strength
(psi)
ASTM D638
12 500 to 13 000 psi
80 to 90 MPa
Compressive
Strength
(psi)
Rupture or Yield
ASTM D695
17 500 to 40 000 psi
120 to 270 MPa
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Flexural
Strength (psi)
Rupture or Yield
ASTM D790
10 000 to 28 800 psi
70 to 190 MPa
Tensile
Modulus (psi)
ASTM D638
300 000 to 400 000 psi
2 to 3 GPa
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Modulus
Compressive
Modulus (psi)
ASTM D695
315 000 to 350 000 psi
2 GPa
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Flexural
Modulus (psi)
ASTM D790
360 000 to 500 000 psi
2 to 3 GPa
At 200 F
--- psi
--- GPa
At 300 F
210 000 psi
1 GPa
Izod
Impact (ft-lb/in of notch)
ASTM D256A
1.5 to 1.7 ft lb/in of notch
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Hardness
Rockwell ASTM D785
W52-99; R129; M95 - 85
--
Shore D65 ASTM D2240/D2583
---
Coefficient
of Linear Thermal Expansion
(10 exp-6 )in/in/C
45 to 56 (10 x exp –6) in/in /C
0.000 045 to 0.000 056 in/in /C
Deflection
Temperature under flexural load (F)
ASTM D648
264 psi ---
460 to 6800 F
66 psi ---
--- F
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Thermal
Conductivity
(10 x exp –4)al cm/sec cm2 C
ASTM C177
2.3 to 4.2 (10 x exp –4) cal cm/sec cm2
0.00023 to 0.00042 cal cm/sec cm2
Specific
Gravity
ASTM D792
1.33 to 0.43
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Density
Water
Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.24 to 0.34 %
Saturation
1.2 %
Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
415 to 560 v/mil
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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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