CGC - 5/8" Sheetrock Ultralight Firecode Core (Type X) Drywall Gypsum Panel, 4' x 12' (see Delivery Disclaimer) This product is developed with additives that support the integrity of the core under fire exposure, resulting in improved fire protection over standard gypsum panels. The industry's lightest 5/8" Type X Panel available for both commercial & residential construction, with a fire resistance rating of up to 1 hour. Benefits are: The lightest 5/8" Type X Panel available Listed by UL for use in fire-rated partitions when installed either vertically or horizontally. UL Classification as to fire resistance, surface burning, and non-combustibility. Offers comparable sound, strength & impact resistance to standard 5/8" Type X. Data Sheet