The panels are cUL Classified for fire resistance and can be used in any UL/ULC Design in which Type SLX panels are listed. Note: Sheetrock Glass-Mat Liner Panels Mold Tough have been comprehensively tested for fire resistance, structural performance and sound control only when used with Sheetrock Shaft Wall and Area Separation Wall framing components. Sheetrock Shaft Wall and Area Separation Wall System components must be used together to ensure superior system performance and safety.