Knauf Fire Resistant Gypsum Boards have been evaluated to meet the requirement for Type X(Special Fire - Resistant) compliant board as defined by ASTM C 1396.These boards are specifically designed for use in areas where fire protection is required. Field of Application: Knauf Type X Fire Resistant Gypsum Boards (GW-TX) are high performance gypsum boards used as the cladding component of drywall constructions such as: Fire rated partitions using metal or wooden frame Fire rated suspended ceilings using metal or wooden frames Fire rated furring and wall linings Fire rated shaftwalls Encasement of steel beams or column with fire protection requirements.