CGC - 5/8" Sheetrock Ultralight Firecode Core (Type X) Drywall Gypsum Panel, 4' x 9' 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