Properties 

Polybutylene
Extrusion compound

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

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)

--- gm /10 min

Melting Temperature  degrees C
Tm Crystalline
126 C

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Contents

Glass Transition (C)
Tg (Amorphous)

--- C

Processing Temperature Range Degrees F
Extrusion

300 to 350 F for compression molding
290 to 380 F for injection molding
290 to 380 F for extrusion

Molding Pressure Range ( PSI) (ksi)
10000 to 30000 psi
10 to 30 ksi
 67to 200 MPa

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Contents

Compression Ratio
2.5

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.003 in/in (unaged)
0.026 in/in (aged)

Tensile Strength at Break
ASTM D638
3800  to 4400 psi
25 to 29 MPa

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Contents

Elongation at break (%)
ASTM D638
300 to 380 % 

Tensile Yield Strength (psi)
ASTM D638
1700 to 2500 psi
11 to 17 MPa

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

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Contents

Flexural Strength (psi)
Rupture or Yield
ASTM D790
2000 to 2300 psi 
13 to 15 MPa

 Tensile Modulus (psi)
ASTM D638
30000 to 40000 psi
0.2 to 0.3 GPa

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
31000 psi
0.2 GPa

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Contents

Flexural Modulus (psi)
ASTM D790
At 73 F
45000 to 50000 psi
0.3 to 0.33 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

No break ft lb/in of notch

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Contents

Hardness
Rockwell ASTM D785
---
--
Shore D65 ASTM D2240/D2583
D55-65

Coefficient of Linear Thermal Expansion
128 to 150 (10 x exp 6) in/in /C
0.000 128 to 0.000 150  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
130 to 140 F
66 psi  ---
215 to 235 F

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Thermal Conductivity
ASTM C177
5.2 (10 x exp 4) cal cm/sec cm2
0.00052   cal cm/sec cm2

Specific Gravity
ASTM D792
0.91 to 0.925

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

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.01 to 0.02%
Saturation 
0.33  %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
>450 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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