Properties

Polypropylene (PP)

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)
0.4 to 100 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
160 to 175 C

Glass Transition (C)
Tg (Amorphous)

- 20 C

Processing Temperature Range Degrees F
Extrusion

375 to 550 F for injection molding
400 to 500 F for extrusion

Molding Pressure Range ( PSI) (ksi)
10 000 to 20 000 psi
10 to 20 ksi

Compression Ratio
2 to 2.4

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

0.010 to 0.025

Tensile Strength at Break
ASTM D638
4500 to 6000 psi

Elongation at break (%)
ASTM D638
100 to 600 %

Tensile Yield Strength (psi)
ASTM D638
4500 to 5400 psi

Compressive Strength (psi)
Rupture or Yield
ASTM D695
5500 to 8000  psi

Flexural Strength (psi)
Rupture or Yield
ASTM D790
6000 to 8000  psi

 Tensile Modulus (psi)
ASTM D638
165 000 to 225 000 psi

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
150 000 to 300 000 psi

To go to Modulus Values,
click on
Modulus

Flexural Modulus (psi)
ASTM D790
At 73 F
170 000 to 250 000 psi
At 200 F
50 000 psi
At 250 F
35 000 psi

To go to Modulus Values,
click on
Modulus

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

0.4 to 1.4 ft lb/in of notch

Hardness
Rockwell ASTM D785
R80 - 
102
Shore D66 ASTM D2240/D2583
--

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
81 to 100 (10 x exp 6) in/in /C
0.000 081 to 0.000 100 in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
120 to 140 F
66 psi  ---
225 to 250 F

Thermal Conductivity
(10 x exp 4)al cm/sec cm2 C
ASTM C177
2.8 (10 x exp 4) cal cm/sec cm2
0.00028  cal cm/sec cm2

Specific Gravity
ASTM D792
0.900 to 0.910

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 
--- %

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

Topics   Index

**************************************
Copyright 2002 by Roger D. Corneliussen
No part of this transmission is to be
duplicated in any manner or forwarded by
electronic mail without the express written
permission of Roger D. Corneliussen
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4/1/2002

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