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gas diffusion in plastics & elastomers
The figures below are a small selection of the available experimental figures. If you are interested in an industrial application of the tabled figures, go to "cases on diffusion" in the upper menu bar.
Conditions
System Temperature:
25 degrees Celsius
System Pressure:
1 Bar
Activity of Permeant
100%
|||||||
Material
Permeant
Solubility
D0*
D|**
Permeability
[-]
[-]
m3stp / m3 x bar
m2/ s
m2/ s
[m3stp / m3] x [m2 / s]
gram / m s
Epoxy Resin
H2
0.1
1 10-11
1 10-11
1 10-12
9 10-11
             

Butyl Rubber
(Poly Isobutylene)
read case on
nitrogen in
BR tyres

CO2
0.67
5.8 10-12
5.8 10-12
3.9 10-12
7.9 10-9
O2
0.12
8.1 10-12
8.1 10-12
9.7 10-13
1.4 10-9
N2
0.054
4.5 10-12
4.5 10-12
2.4 10-13
3.0 10-10
H2
0.035
1.5 10-10
1.5 10-10
5.3 10-12
4.7 10-10
             

PET (Poly Ethylene Terephthalate) ~100% crystalline
read case on
carbon dioxide in
PET bottles

CO2
1.4
5.4 10-14
6 10-14
8 10-14
2 10-10
O2
0.091
5.6 10-13
5.6 10-13
5.1 10-14
7.2 10-11
N2
0.032
1.4 10-13
1.4 10-13
3.6 10-15
4.4 10-12
H2
0.081
8.0 10-12
8.0 10-12
6.4 10-13
5.7 10-11
|
| | | | | |
HDPE (High Density Poly Ethylene)
CO2
0.29
1.2 10-11
1.2 10-11
3.5 10-12
6.8 10-9
O2
0.046
1.7 10-11
1.7 10-11
7.8 10-13
1.1 10-9
N2
0.025
9.3 10-12
9.3 10-12
2.3 10-13
2.8 10-10
H2
0.073
2.6 10-11
2.6 10-11
1.9 10-12
1.7 10-10
|
|
|
|
|
|
|
LDPE (Low Density Poly Ethylene)
CO2
0.25
3.7 10-11
3.7 10-11
9.4 10-12
1.8 10-8
O2
0.050
4.6 10-11
4.6 10-11
2.3 10-12
3.2 10-9
N2
0.021
3.2 10-11
3.2 10-11
6.4 10-13
7.9 10-10
H2
0.16
4.7 10-11
4.7 10-11
7.6 10-12
6.8 10-10
|
|
|
|
|
|
|
PP (Poly Propylene)
CO2
0.17
1.4 10-11
1.4 10-11
2.4 10-12
4.7 10-9
O2
0.029
2.5 10-11
2.5 10-11
7.4 10-13
1.0 10-9
             
PC (Poly Carbonate)
CO2
5.0
9.6 10-13
1 10-12
5 10-12
1 10-8
O2
0.36
4.2 10-12
4.2 10-12
1.5 10-12
2.1 10-9
N2
0.077
2.6 10-12
2.6 10-12
2.0 10-13
2.5 10-10
|
|
|
|
|
|
|
PS (Poly Styrene)
CO2
0.80
5.8 10-12
5.8 10-12
4.6 10-12
8.9 10-9
O2
0.15
1.1 10-11
1.1 10-11
1.7 10-12
2.4 10-9
N2
0.021
9.6 10-12
9.6 10-12
2.0 10-13
2.5 10-10
|
|
|
|
|
|
|
PVC (Poly Vinyl Chloride)
CO2
0.47
2.5 10-13
2.5 10-13
1.2 10-13
2.4 10-10
O2
0.029
1.2 10-12
1.2 10-12
3.5 10-14
4.9 10-11
N2
0.023
3.8 10-13
3.8 10-13
8.7 10-15
1.1 10-11
H2
0.026
5.0 10-11
5.0 10-11
1.3 10-12
1.2 10-10
*.. D0 is the "zero concentration" mutual diffusion coefficient interpreted on basis of Fick's 1st & 2nd Laws.
** D| is the "weighted average" mutual diffusion coefficient interpreted on basis of Fick's 1st & 2nd Laws.
 
 
   

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