USG Fiberock® Brand AR Interior Panels are engineered to provide increased resistance to abrasion, indentation and penetration for interior walls and ceilings in demanding construction applications. These gypsum- fiber panels are designed to out perform paper-faced gypsum board. Strong, solid and durable, they resist denting, breaking and puncturing— even in high-traffic areas. USG Fiberock AR Interior Panels are code approved for use in noncombustible construction. They have exceptional surface burning characteristics (ASTM E84, Flame Spread 5, Smoke Developed 0) and fire resistance(ASTM E119). 15.9 mm USG Fiberock AR Interior Panels may be used instead of Type X gypsum panels in over 50 fire-rated wall assemblies as listed in the UL Fire Resistance Directory.