Stacks of gypsum board, waiting to be delivered directly into the building.
Type X gypsum board is 5/8 in thick, it is used as a method of fire resistance, and contributes to much of the fire resistance rating of a building. ASTM is incharge of conducting tests to determine the fire resistance of gypsum board. To get type X rating the wallboard has to achieve at least a one hour fire resistance rating
Type X wallboard is made with noncombustible fibers, they maintain the integrity of the core as the wallboard begins to shrink.

Gypsum board being delivered directly into the building, onto the floor on which they will be installed.