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>Fire</strong> Resistive Properties of Gypsum<strong>Understanding</strong> <strong>UL</strong>• Gypsum-protected wood or steel structural members areexposed to fire.• Water in board is released as steam and acts as a<strong>the</strong>rmal barrier until calcination is completed.• Temperature directly behind <strong>the</strong> plane of calcination isonly slightly hotter than that of boiling water which issignificantly lower than <strong>the</strong> temperature at which steelbegins losing strength or wood ignites.