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Permeability of AFC Standard Bags to N2, O2, CO2, H2O
°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
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°C use this formula:
Permeability Chart Computation
(O2) @37°C - 0.3079 x cm2 = Oxygen Permeability
(CO2) @37°C - 0.7101 x cm2 = Carbon Dioxide Permeability
(N2) @37°C - 0.1155 x cm2 = Nitrogen Permeability
(H2O) @37°C - 0.0000628 x cm2 = Water Permeability
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