Polypropylene (PP)
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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
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
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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