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Table 9 Permeability coefficient of various materials

From: Long permanence high altitude airships: the opportunity of hydrogen

 

P(He)

(P(H2)

P(O2)

Poly(ethylene) density 0.914 g/cm^-3

7.40E-13

3.70E-13

2.20E-13

Polyvinilecloride plasticized 10 %

1.30E-13

–

3.83E-16

Polyvinilacetate

4.95E-13

2.99E-13

1.36E-14

Poly(trifluorochloroethylene) film 30 % cristallinity

7.05E-14

5.10E-13

3.00E-15

Mylar A

4.88E-14

2.44E-14

3.00E-15

Nylon 6

–

3.98E-14

2.85E-15

Nylon 11

1.34E-13

1.46E-13

–

Cellophane (relative humidity 43 %)

1.20E-15

–

5.36E-16