The protective coatings are our main emphasis, and many coatings are intended to protect something from water or moisture. These are termed moisture barrier coatings, and proof of their moisture barrier properties can be made by assessing moisture damage (such as corrosion, which is complicated and suspect), or by a more rigorous moisture vapor transmission measurement. First let us examine how moisture may migrate through a film. Three migration methods are Used to explain the differences of scale perceived in barrier film assessments.
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