High Density Polyethylene (HDPE)
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Copyright 2002 by Roger D. Corneliussen
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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
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
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
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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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