Re: High Density Polyethylene (HDPE)

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mail2 wrote:

Properties 

High Density Polyethylene (HDPE)

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 ( xem entry truoc )

Compressive Modulus (psi)
ASTM D695
--- psi

To go to Modulus Values,
click on
Modulus ( xem entry truoc )

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

To go to Modulus Values,
click on
Modulus ( xem entry truoc )

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 ( 30 USD mới coi tiếp được nha)

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