Gold Bond® Brand SoundBreak XP Wall Board with Sporgard has an acoustically enhanced, high density fire resistant Type x gypsum core encased in a heavy, abrasion and mold/mildew/moisture resistant, 100% recycled, National Gypsum Purple® paper on both sides. Used in the construction of high rated STC wall assemblies, this thick wall board consists of a layer of viscoelastic damping polymer sandwiched between two pieces of high density mold resistant wall board, providing constrained layer damping.