12mm thick gypsum board is the proportion of how much?
You are in the water to know.
If it is ordinary gypsum board, are generally floating on the water, the density is certainly less than 1.
If it is a special gypsum board, add a lot of glass fiber and the like, the density may be slightly greater than 1.
Generally around 1800kg / m?. Different manufacturers, different brands, the proportion is not the same.
Gypsum board generally used surface density measurement, for example: 9.5mm thickness gypsum board, the national standard requires its surface density to be less than 9.5Kg / m2, but most of the better quality gypsum board density control in (6.5-7.2) Kg / M2. If compared with the density of water, the proportion of ordinary gypsum board is less than water. But the refractory board due to gypsum core inside the addition of glass fiber, depending on the amount of added, the density may be greater than the density of water.
