... water percolation or water drop on, the back side. 12mm.Flame Spread:4.7Smoke Spread:27Non-Combustible:ASTM E136, E84-05 ... and feel like hard cement plastering but is fireproof and resistant to damage from water, humidity, freezing, organisms, chlorine, salt and ... Wall LiningEaves and Staff LiningPre-fabricated Shelter-Internal/External walls Fire resistant Magnesium Oxide Board