Product Description Size: 1220x2440 Thickness: 3mm-20mm Our product is mainly being composed of magnesium chloride, magnesia and plant fiber, which has been launched onto the market through years of hard research and process innovation. It uses advanced environmental protection technologies free from asbestos, plaster, lime, cement, formaldehyde and radioactive substances. The nonpoisonous, odorless, environment-friendly, fire-retardant and moisture resistant characteristics make it an ideal replacement of loam brick. It enjoys more strong points in many fields compared with block board, gypsum board, cement board and aluminum plastic composite board. It has been classified as E1 environmental product, A-grade fireproof board with more than 4 hours of fire rating by national inspection body.Advantages: 1. Fireproof: 1) A-grade product. 2) Fire endurance limit is more than 4 hours.2. Waterproof. 3. Environmental: Nonpoisonous, odorless, environment-friendly, fire-retardant and moisture resistant, E1environmental product. 4. Planeable, sawable, nailable and drillable: The way of processing is very simple as other boards.5. Saving processed time, room and supplemental materials: 1) Processed time: The fixing is very simple and the processed time is short. 2) Room: By using fireproof board, you can reduce the area of the wall and increase the housing area. 3) Supplemental materials: It is smoother, so you can save putty and coating or some kind. 4) High strength: 1. Non-aging. 2. Non-deformation. 3. During the process of making, fireproof board does not absorb insect. 4. Being different from solid wood floor, it will not rot. 5. It can not only resist acid and alkali but also can be used for a long time.