The Annealing Principle Of Glass Products

1, the cause of thermal stress The formation of glass thermal stress is caused by the change in temperature when the glass changes from liquid to solid during the forming process of glass products
There are two commonly used test methods for the internal stress of flat glass: surface stress and plate stress
The reason is that the internal stress will make the glass become optically anisotropic, which will affect the optical properties of the glass, so this phenomenon is used to measure the size of the internal stress of the glass. This is also the reason why the internal stress of glass is often expressed by the optical path difference, and the unit is: nanometer (nm) or millimeter.