Flat glass is generally divided into tempered glass, semi tempered glass and annealed glass according to the size of surface compressive stress. According to the American ASTM C1048-1997b standard, the surface compressive stress range of various glasses is 69 MPa (10000 psi) for tempered glass, and that of semi tempered glass is:

What are the precautions for the use of the X-ray stress meter? Dongyi Seiko will share with you: before the X-ray stress meter is transported for a long distance, an angle support should be installed to prevent the X-ray tube sleeve from displacement due to shock during transportation. Before reusing the X-ray stress meter

For a large number of users who have a rigid demand for polarized stress meters, it is clear that the testing principle is the prerequisite for carrying out measurement work and improving the production process. Some customers have not yet received the polarizing stress meter even after it was purchased and used for a period of time