Grey MgO boards is that fly ash will be added to make them perform excellent in climate resistence and waterproof.
High density, white MgO board density is over than 0.96g/cm3 , grey MgO board is over than 1.0g/cm3
Grey color MgO board with excellent water resistance is suitable exterior use.
White waterproof MgO boards is suitable for interior separation walls,
White Color Mgo board and Grey Color Mgo board can replace fiber cement board.