| http://www.w3.org/ns/prov#value | - The low gas permeable material encircling the cladding should preferably have such gas permeability that when a tubular member shaped therefrom of 1 m long is placed in a humid atmosphere at 60??? C. and RH 90% for one week, the amount of moisture (water) penetrating into the member is less than 0.2 g, especially less than 0.05 g.
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