Gold Bond® BRAND 1/2" SoundBreak® XP® Gypsum Board with Sporgard™* has an acoustically enhanced, high density gypsum core encased in a heavy, abrasion and mold/mildew/moisture resistant, 100% recycled, purple paper on both sides. Used in the construction of high rated STC wall assemblies, this 1/2" thick gypsum board consists of a layer of viscoelastic damping polymer sandwiched between two pieces of high density mold resistant gypsum board, providing constrained layer damping.