| General Comparison (using "Good" as the benchmark) |
|
Property |
CPP |
BOPP |
LDPE |
|
Tear Strength |
Better |
Good |
Best |
|
Modulus (stiffness) |
Better |
Best |
Good |
|
Low Temp Impact Resistance |
Better* |
Good |
Best |
|
Dimensional Stability |
Best |
Good |
Better |
|
Haze |
Better |
Best |
Good |
|
Heat Sealing |
Better |
Good** |
Best |
|
Barrier |
Better |
Best |
Good |
|
Area Factor (Yield) |
Best |
Better |
Good | |
* Some PP impact polymers have excellent low temperature impact but generally have high haze.
** dependent upon seal coating. uncoated BOPP does not seal. |
| Typical Properties (1.0 mil film) |
|
Property |
CPP 1 |
BOPP 1 |
LDPE 2 |
|
Haze (%) |
2 – 3.5 |
1 – 2 |
5+ |
|
Gloss (%) |
86 - 89 |
88 – 92 |
75 - 80 |
|
Elongation (%) |
600 |
200 |
400 |
|
Modulus/Stiffness (kpsi) |
75 - 130 |
350+ |
<55 |
|
Impact (Glass Transition Temp. 0C) |
3 |
4 |
-7 |
|
Area Factor (yield - in2/lb) |
31,000 |
30,500 |
29,800 |
|
Heat Resistance (0C) |
145 - 160 |
150 – 160* |
<100 |
|
Tensile Strength (psi) |
7,000 |
15,000 |
3,000 |
Tear Strength (g/mil)
TD
MD |
500
30
|
10
5
|
300
200
|
|
Surface Treatment (dyne) |
36 - 38 |
36 – 38 |
42+ |
|
Barrier: O2 (cc/100in2/day)
H2O (gm/100in2/day) |
220
0.8 |
120
0.4 |
500
1.3 | |
1 – Cast Film Extrusion
2 – Blown Film Extrusion
* heat resistance of base polymer, dimensional stability may be affected
depending upon orientation heat set temperature.
|
