Cement or gypsum for installing convex window stones

Cement. The casement stone is made of cement, which is very strong, so that it can bear very heavy weight in the future, and it will not be deformed, out of shape, and will not need to be repaired because of veneer and adhesive materials. The plaster used for window sash stone is not firm, and it will fall off in the future, which is very dangerous. Cement is stronger and better. Cement: powder hydraulic inorganic cementing material. Mud can be hardened in air or water after being mixed with water, and can firmly bond sand, stone and other materials together.