Firecode Gypsum Type C is developed with additives that support the integrity of the core under fire exposure, resulting in improved fire protection over standard Firecode® panels. CGC Sheetrock® Brand Firecode® C core panels are UL-Listed (Type C) for application in fire-rated construction and comply with Type X requirements. Systems using CGC Sheetrock® Brand Firecode® C core panels qualified for fire ratings of up to 4 hours in walls, 3 hours in ceilings and 4 hours for column protection.