Properties 

High Density Polyethylene (HDPE)

Topics   Index

**************************************
Copyright 2002 by Roger D. Corneliussen
**************************************

To jump to a particular property, click on the name listed below.

From Modern Plastics Encyclopedia 99, p. B-198

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)
5 to 18 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
130 to 137 C

Glass Transition (C)
Tg (Amorphous)

--- C

Processing Temperature Range Degrees F
Extrusion

350 to 500 F for injection molding
350 to 525 F for extrusion

Molding Pressure Range ( PSI) (ksi)
12 000 to 15 000 psi
12 to 15 ksi

Compression Ratio
2

Mold(Linear) Shrinkage (in/in)
ASTM D955

0.015 to 0.040

Tensile Strength at Break
ASTM D638
3200 to 4500 psi

Elongation at break (%)
ASTM D638
10 to 1200 %

Tensile Yield Strength (psi)
ASTM D638
3800 to 4800 psi

Compressive Strength (psi)
Rupture or Yield
ASTM D695
2700 to 3600  psi

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

 Tensile Modulus (psi)
ASTM D638
155 000 to 158 000 psi

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
--- psi

To go to Modulus Values,
click on
Modulus

Flexural Modulus (psi)
ASTM D790
At 73 F
145 000 to 225 000 psi

To go to Modulus Values,
click on
Modulus

Izod Impact (ft-lb/in of notch)
ASTM D256A

0.4 to 4.0 ft lb/in of notch

Hardness
Rockwell ASTM D785
---
Shore D66 ASTM D2240/D2583
73

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
59 to 110 (10 x exp 6) in/in /C
0.000 059 to 0.000 110 in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
--- F
66 psi  ---
175 to 196 F

Thermal Conductivity
(10 x exp 4)al cm/sec cm2 C
ASTM C177
11 to 12 (10 x exp 4) cal cm/sec cm2
0.0011 to 0.0012 cal cm/sec cm2

Specific Gravity
ASTM D792
0.952 to 0.965

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

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

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
450 to 500 v/mil

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
**************************************