... 3.Edge:square,tegular edge Low Density Mineral Wool Ceiling Board Edge DetailMetric System(mm)British System(mm) ... Humidity Resistance(RH)>=90%Light reflectivity>=95%Mineral Fiber Ceiling Tiles Fire Performancenon-combustible,reach class A according ... x 1200mm, 600x600mm, 600x1200mm etcEdge finishsquare edge, tegular edge, concealed edge, microlook tegular edgeThickness12mm, 13mm,14mm, 15mm, 16mm,18mm ...