What Is The Stress Spot Of Tempered Glass?

What is the stress spot of tempered glass? Tempered glass is a kind of building material with high safety performance. Once it came out, it was welcomed by the market. However, there are two inevitable and difficult to solve problems in tempered glass, that is, tempered glass self-explosion and stress spots. Many people are relatively unfamiliar with stress spots, today for you to make a brief introduction. The stress spot phenomenon of tempered glass is also called the optical anisotropy effect of tempered glass. Cause: When a beam of polarized light passes through the tempered glass due to the permanent stress inside the glass (tempered stress), the light will be decomposed into two beams of polarized light with different propagation speeds, that is, fast light and slow light. When two beams of light formed at a certain point intersect with a beam formed at another point, due to the difference in the speed of light propagation, there is a phase difference at the intersection point of the beam, at which point the two beams will interfere and form interference fringes, as shown in the figure below: Under a certain amount of light, observing the glass from a non-vertical Angle, especially when the light incidence Angle is 56 degrees, you will see some fuzzy irregular dots or ribbon markings, which often show dot color, which is the stress spot. Stress spots are formed during the heating and quenching cooling process of (semi-) tempering, because both heating and cooling processes can not be 100% uniform, and the anisotropic properties of the strengthened glass are obvious, and the propagation and reflection of the light beam in the glass will become non-parallel, and stress spots are formed. The stress spot does not affect the reflection and transmission effect of the glass, nor does it affect the safety performance of the tempered glass, which is an optical characteristic of all tempered glass and does not belong to the quality problem. Although the stress spot and tempered glass self-explosion phenomenon can not be avoided, but the equipment has been improved, only when the instrument detection can be found, so no matter what type of glass to buy, we must choose a manufacturer with high brand awareness and product quality assurance.