Properties 

Polybutylene Terephthalate /PBT
Unfilled

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
220 to 267 C

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Contents

Glass Transition (C)
Tg (Amorphous)

--- C

Processing Temperature Range Degrees F
Extrusion

435 to 525 F for injection molding

Molding Pressure Range ( PSI) (ksi)
4000 to 10000 psi
4 to 10 ksi
 27to 67 MPa

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Contents

Compression Ratio
1.74 to 5.5

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.009 to 0.022 in/in

Tensile Strength at Break
ASTM D638
8200  to 8700 psi
55 to 58 MPa

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Contents

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

Tensile Yield Strength (psi)
ASTM D638
8200 to 8700 psi
55 to 58 MPa

Compressive Strength (psi)
Rupture or Yield
ASTM D695
8600 to 14500 psi
57 to 97 MPa

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Contents

Flexural Strength (psi)
Rupture or Yield
ASTM D790
12000 to 16700 psi 
80 to 111 MPa

 Tensile Modulus (psi)
ASTM D638
280000  to 435000 psi
1.9 to 2.9 GPa

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Modulus

Compressive Modulus (psi)
ASTM D695
375000 psi
2.5 GPa

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Contents

Flexural Modulus (psi)
ASTM D790
At 73 F
330000 to 400000 psi
2.2 to 2.7 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

0.7 to 1.0 ft lb/in of notch  

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Contents

Hardness
Rockwell ASTM D785
M68 to 78
--
Shore D65 ASTM D2240/D2583
D55-65

Coefficient of Linear Thermal Expansion
60 to 95 (10 x exp 6) in/in /C
0.000 060 to 0.000 095  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
122 to 185 F
66 psi  ---
240 to 375 F

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Contents

Thermal Conductivity
ASTM C177
4.2 to 6.9 (10 x exp 4) cal cm/sec cm2
0.00042 to 0.00069   cal cm/sec cm2

Specific Gravity
ASTM D792
1.30 to 1.38

To go to Density /Specific Gravity Values,
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Density

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.08 to 0.09%
Saturation 
0.4 to 0.5  %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
420 to 550 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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