Properties 

Low Density Polyethylene /LDPE

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)

0.25 to 27.0 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
98 to 115 C

Glass Transition (C)
Tg (Amorphous)

-25 C

Processing Temperature Range Degrees F
Extrusion

300 to 450 F for injection molding
250 to 450 F for extrusion

Molding Pressure Range ( PSI) (ksi)
5000 to 15 000 psi
5 to 15 ksi
33 to 100 MPa

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Compression Ratio
1.8 to 3.6

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.015 to 0.050

Tensile Strength at Break
ASTM D638
1200 to 4550 psi
8 to 30 MPa

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Elongation at break (%)
ASTM D638
100 to 650 %

Tensile Yield Strength (psi)
ASTM D638
1300 to 2100 psi
9 to 14 MPa

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

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Flexural Strength (psi)
Rupture or Yield
ASTM D790
---  psi
--- MPa

 Tensile Modulus (psi)
ASTM D638
25 000 to 41 000 psi
0.2 to 0.3 GPa

To go to Modulus Values,
click on
Modulus

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

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Flexural Modulus (psi)
ASTM D790
At 73 F
35 000 to 48 000 psi
0.2 to 0.3 GPa
At 200 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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Hardness
Rockwell ASTM D785
---
--
Shore D65 ASTM D2240/D2583
Shore D44-50

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
100 to 220 (10 x exp 6) in/in /C
0.000 100 to 0.000 200  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
--- F
66 psi  ---
104 to 112 F

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Thermal Conductivity
(10 x exp 4)al cm/sec cm2 C
ASTM C177
8 (10 x exp 4) cal cm/sec cm2
0.0008   cal cm/sec cm2

Specific Gravity
ASTM D792
0.917 to 0.932

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

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

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
450 to 1000 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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