Two techniques were used in the deposition of thin, pinhole‐free vapor barriers upon a Kraft fiber mat without affecting its combustibility properties. One technique involved a collodion spray precoating followed by low pressure styrene plasma coating, and the other involved a collodion spray coating. In the formation of the above coatings, two functional steps are essential: (1) surface pore covering, and (2) nonporous barrier formation.
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Liepins et al. (1971) studied this question.
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