Magnesium oxide board is made of nonflammable materials including magnesium chlo-ride,magnesia,alkali endured epoxyglass cloth,and perlite. It is manufactured by using special craft through totally automatic production line. It is really green fire prevention product without such harmful elements as asbestos,formaldehyde or benzene. Benefits 1)fireproof (2)waterproof and moisture proof (3) heat preservation and protection (4) sound absorb and insulation (5)light quality and high intensity (6) green environment protection Specification Normal size: 2440x1220mm Length scope:1800-3000mm,Width scope:900-1220mm,Thickness scope:3mm-20mm (Special specification can be custom according to your request) WELCOME VISIT WWW.WORLDPULL.COM TO GET MORE INFORMATION.