magnesium oxide board functions: 1) Flame proof: Resistant to combustion at 800 degree and remains flameless at 1,200 degree 2) Non-flammability: GB8624 grade A 3) Waterproof: resistant to deformation in wet environments 4) Weight: Light weight,(volume weight: 0.85 1.27g/cm3) 5) Strength: Bendable and impact resistant 6) Invariability: Resistant to deformation in wet, hot and dry conditions 7) Sound insulation: Sound loss through a 6mm thick Tolar TM plate-29dB 8) Heat Resistance: Thermal conductivity of 0.216w/mk 9) Durability: Resistance to halogen accumulation, long lasting strength 10) Cold resistance: can be used at 40 degree 11) Installation: Easy to work, fix and decorate 12) Environmentally friendly: free of asbestos, formaldehyde and ammonia standard:1220*2440,thickness:3mm-20mm. our products support by ISO,CE,etc.certificate. WELCOME VISIT WWW.WORLDPULL.COM TO GET MORE INFORMATION.