Properties 

Polyimides /PI

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 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

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
315 000 to 350 000 psi
2  GPa

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Flexural Modulus (psi)
ASTM D790
At 73 F
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

To go to Density /Specific Gravity Values,
click on
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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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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