Properties 

Polyethylene Terephthalate /PET
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
212 to 265 C

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Glass Transition (C)
Tg (Amorphous)

68 to 80 C

Processing Temperature Range Degrees F
Extrusion

440 to 660 F for injection molding
520 to 580 F for extrusion

Molding Pressure Range ( PSI) (ksi)
2000 to 7000 psi
2 to  7 ksi
13 to 47 MPa

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Compression Ratio
3.1

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

Tensile Strength at Break
ASTM D638
7000  to 10500 psi
47 to 70 MPa

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

Tensile Yield Strength (psi)
ASTM D638
8600 psi
57 MPa

Compressive Strength (psi)
Rupture or Yield
ASTM D695
11000 to 15000 psi
73 to 100 MPa

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Flexural Strength (psi)
Rupture or Yield
ASTM D790
12000 to 18000 psi 
80 to 120 MPa

 Tensile Modulus (psi)
ASTM D638
400000  to 600000 psi
2.7 to 4.0 GPa

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Modulus

Compressive Modulus (psi)
ASTM D695
--- psi
--- GPa

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Flexural Modulus (psi)
ASTM D790
At 73 F
350000 to 450000 psi
2.3 to 3.0 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

0.25 to 0.7 ft lb/in of notch  

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Hardness
Rockwell ASTM D785
M94-101; R111
--
Shore D65 ASTM D2240/D2583
---

Coefficient of Linear Thermal Expansion
65 (10 x exp 6) in/in /C
0.000 065  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
70 to 150 F
66 psi  ---
167 F

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Thermal Conductivity
ASTM C177
3.3 to 3.6 (10 x exp 4) cal cm/sec cm2
0.00033 to 0.00036   cal cm/sec cm2

Specific Gravity
ASTM D792
1.29 to 1.40

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Density

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.1 to 0.2%
Saturation 
0.2 to 0.3  %

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

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