Labels:bulletin board | crt screen | dialog box | monitor | window | windowpane OCR: Understanding the UL Fire Resistance Directories Fire Resistive Properties of Gypsum Gypsum 1S approximately 21 percent by weight chemically combined water which greatly contributes to effectiveness as fire resistive barrier When gypsum- protected wood JO steel structural members are exposed to fire, the chemically combined water being released as steam acts as a thermal barrier until this slow process, known as calcination. completed. The temperature directly behind the plane of calcination 15 only slightly hotter than that ofi boiling water which is significantly lower than the temperature at which steel begins losing strength or ignites. Prev Next
