Understanding the UL Fire Resistance Directories - Ron Blank ...
Understanding the UL Fire Resistance Directories - Ron Blank ...
Understanding the UL Fire Resistance Directories - Ron Blank ...
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<strong>Understanding</strong> <strong>UL</strong>Regular Gypsum Board• All gypsum board affords a degree of natural fireresistance. The fire resistant noncombustible core iscomposed mainly of gypsum.