PP/PE Properties
Comparison of Resin Properties
Hi-Core® Polypropylene and Hi-Density Polyethylene
PROPERTY
TEST
SI Units
Polypropylene
Polyethylene
Eng. Units
SI Units
Eng. Units
SI Units
Melt Index
ASTM D1238
1.4 dg
0.4 dg
Density
ASTM D1505
0.898 gm/cm
3
3 0.955 gm/cm12
Tensile @ Yield
ASTM D638
27 MPa
3,880 psi
28 MPa
4,100 psi
Elongation @ Yield
ASTM D638
10%
10%
800%
800%
Flexural Modules
ASTM D790
1,220 MPa
177,000 psi
1,220 MPa
177,000 psi
ESCR, F
50
ASTM D1639
n/a
n/a
25 hr
25 hr
Izod Impact
ASTM 256
1.59 J/cm
2.99 Ft•lb/in
2.1 J/cm
3.93 Ft•lb/in
Softening Pt. (Vicat)
ASTM D1525
143 °C
290 °F
128 °C
263 °F
Softening Temp. (range)
n/a
n/a
112 °C - 132 °C
234 °F - 270 °F
Melting Temp. (range)
160 °C - 166 °C
320 °F - 330°F
125 °C - 135 °C
257 °F - 275 °F
Low Temp. Brittleness
ASTM D746
-5 °C
23 °F
<-70 °C
<-94 °F
Hardness
D785/D2240
90 Rockwell (R Scale)
69 (Shore D Scale)
Chemical Reactivity
Acid Free
Acid Free
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