Steel has fire resistant properties, and therefore Steel Deck does. Steel is inherently fire-resistant because it has a high melting point and does not contribute fuel to a fire.  It retains its structural integrity even when exposed to high temperatures.  However, steel can lose its strength and deform under prolonged exposure to extreme heat. The fire resistance capability of a system depends on factors such the deck thickness, concrete depth (if poured) and what other fire resistance measures are used (such as spray-on fireproofing).  The fire resistance of a steel deck system is typically tested and rated according to specific standards and regulations, such as those provided by organization like Underwriters Laboratories (UL) and can be found in their literature.  This information can commonly also be found in the deck manufacturer’s brochure.