It is so important to select the qualified glass sheet before glass processing, i.e. tempering.

Defective glass sheet may lead to quality issues and shattering during the process. Avoid using glass sheet containing stones. Especially in the tensile stress area, even tiny stones could become the cause of spontaneous glass breakage. Because the expansion coefficient of stone is different from that of glass, cracks can appear around the stones. area. As a result, the proper selection of glass sheet is a key factor to ensure the high quality of the glass after tempering.