|
 The
chart below gives the permeability of our bags as actually
measured.
|
Permeability of AFC Standard Bags to N2, O2,
CO2, H2O
|
|
Degrees
C
|
|
.005 FEP
Film N2 P cc/m2/d |
|
.005 FEP Film O2P
cc/m2/d |
|
.005 FEP Film CO2P
cc/m2/d |
|
.005 FEP Film H2O
P
cc/m2/d |
|
40 |
|
1280 |
|
3460 |
|
7700 |
|
0.807 |
|
37 |
|
1155 |
|
3079 |
|
7101 |
|
0.628 |
|
25 |
|
746 |
|
2195 |
|
5246 |
|
0.227 |
|
5 |
|
315 |
|
1075 |
|
3063 |
|
0.027 |
|
3 |
|
288 |
|
980 |
|
2850 |
|
0.021 |
|
1 |
|
263 |
|
916 |
|
2685 |
|
|
|
-25 |
|
73 |
|
187 |
|
565 |
|
|
|
-78 |
|
3.5 |
|
7.5 |
|
|
|
|
|
-80 |
|
2.8 |
|
5.9 |
|
|
|
|
|
-125 |
|
0.019 |
|
0.091 |
|
|
|
|
|
-196 |
|
|
|
|
|
|
|
|
|
-273 |
|
|
|
|
|
|
|
|
You will note that the permeability changes
greatly with change in temperature.
To calculate the amount of gas that will
enter or exit your particular bag at 37 degrees Celsius use this
formula:
Permeability
Chart Computation
(O2) @370 - 0.3079 x cm2
= Oxygen Permeability
(CO2) @370 - 0.7101 x cm2 =
Carbon Dioxide Permeability
(N2) @370 - 0.1155 x cm2
= Nitrogen Permeability
(H2O) @370 - 0.0000628 x cm2
= Water Permeability
|
