In the use of gypsum board machinery and equipment, the setting time of gypsum directly affects the production efficiency and product quality of the equipment. In general, how long is the setting time of gypsum and what kind of chemical principle does it exist?
It is generally believed that the commonly used plaster fixation can coagulate in about two hours after fracture. The paste formed by adding gypsum to water will gradually solidify into a hard lump. This process is equivalent to the reaction of CaSO4 H2O to CaSO4 2H2O. It releases a lot of heat, so that CaSO4 2H2O can be interconnected into a porous solid.
The factors affecting the solidification rate of gypsum are the quality of gypsum powder, the improper proportion of gypsum powder and water, the mixing time and speed, and water temperature. Therefore, it is necessary to pay attention to these items in order to complete the solidification of gypsum in general.