New building materials are constantly appearing in the board market, such as glass magnesium board, a composite material with strong fire resistance.

Glass magnesium board (commonly known as magnesium oxide board) is a magnesium cementitious material with stable performance, which is made of magnesium oxide, magnesium sulfate, and water ternary system, configured and modified by adding modifiers. It is a new type of non-combustible decorative material composited with medium alkaline glass fiber mesh as reinforcing material and lightweight material as filler. 

The inherent moisture resistance of glass magnesium board meets the requirements of outdoor use of aluminum-plastic board lining. It can naturally restore to its original moisture content after raining, without deformation or falling off. After long-term practice, it meets the use requirements.

The moisture content of wood board should be 8-12%. The relative humidity in the south is high, and the moisture content can be higher, but not more than 15%. The relative humidity in the north is low and the air is dry, about 6-12%. The moisture content of Shiyoumei board is controlled below 8% to avoid the formation of core bubbles (commonly known as bubble board). The moisture content should be determined according to the local wood equilibrium moisture content. The same board core should have the same moisture content.