Gypsum wallboard with enhanced fire resistance, and related coatings and methods
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United States of America Patent
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Jul 18, 2023
Grant Date -
Dec 17, 2020
app pub date -
Feb 28, 2020
filing date -
Jun 17, 2019
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Abstract
Disclosed are an organic binder-based coating; a composite gypsum board containing face and back cover sheets, an outside surface of the back cover sheet bearing the coating; and a method of preparing composite board where the back cover sheet contains the coating on its outer surface. The coating is formed from a composition comprising an alkaline silicate, a solid filler, and optionally, a borate. An enhancing layer can also be applied to the back cover sheet.
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