USG Sheetrock® Brand EcoSmart Panels Firecode® X represent a revolution in wallboard manufacturing, significantly reducing the need for natural resources and impact on the environment. These 5/8" lightweight Type X gypsum panels have been formulated to achieve all of the strength and performance characteristics as standard 5/8" USG Sheetrock® Brand Firecode® X Panels at a significantly lower environmental impact and reduced weight. Listed in the most widely specified UL fire-rated wall, column, and floor- and roof-ceiling designs, USG Sheetrock® Brand EcoSmart Panels Firecode® X can be used in any UL design in which UltraLight Innovation Type X (ULIX™) panels are listed.