The choice of glass substrate is also very important for tempering glass. The float glass from some manufacturers has scratches. In addition, the stones and sands on glass substrates also may cause the vibration between glass during the transportation, and subsequently causes the secondary scratch in relative motion. Therefore, it's better to choose the float glass substrates produced by the competent manufacturers with good brands. 

The scratch of tempering glass may be caused by one or more factors. Therefore, strictly control each step in the production, strengthen the management and continuously improve. Carry out strict inspection in the whole process of production, and ensure the inspection method combining self-inspection, mutual inspection and special inspection. In the process, especially intensify the training of the whole staff's awareness of quality, so as to enable each employee to understand the importance of their jobs and be aware that each of their action may have big influence on the product quality and even result in defective or waste products. These means may prevent the tempering glass against scratches to the largest extent.