USG Sheetrock® Brand Mold Tough® Gypsum Liner Panel have a noncombustible, moisture- and mold-resistant gypsum core that is encased in moisture- and moldresistant, 100 percent recycled blue face and back papers. The panels are UL Classified as to fire resistance (Type SLX) and feature double beveled edges for easy installation. Panel may be substituted for USG Sheetrock® Brand Gypsum Liner Panels in all Shaft Wall and Area Separation Firewall systems. 

With USG Sheetrock® Brand Shaft Wall and Area Separation Wall Systems framing components, USG Sheetrock® Brand Mold Tough® Gypsum Liner Panels, as defined in this document, have been tested for fire resistance, structural performance, and acoustical performance. Shaft Wall and Area Separation Wall System components from the USG Sheetrock® Brand guarantee optimum system performance and safety when used together. In order to verify the system performance parameters while using alternative system components with USG Sheetrock® Brand Mold Tough® Liner Panels, the manufacturer(s) of the replacement component(s) should be contacted.