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(6.1) Gas Permeability

In contrast to other elastomers the gas permeability of Silicones is very high. In fact, permeability is 30 times that of natural rubber and 400 times that of Butyl rubber.

Although an obvious disadvantage in seals for gas containers, Silicones find plenty of uses where gas permeability is an advantage i.e. contact lenses, fabric coatings and breathable medical applications.