A magnesium oxide (MgO) board—commonly known as an MgO board—is a factory-made, rigid building panel used as a high-performance alternative to traditional drywall, cement board, or plywood.
Fire Resistance: Non-combustible (often rated A1) and can provide 1 to 2 hours of fire protection in assemblies
*Moisture & Mold Resistance: Does not warp, swell, or support mold, mildew, or fungus growth when exposed to water or high humidity.