The self-brust of tempered glass in most doors and windows is a small probability event. Generally speaking, the self-brust rate of tempered glass is around 3-5%, and it is not easy to hurt people after being broken. As long as we can detect and handle it in a timely manner, we can reduce the risk to a lower level.

Today, let’s talk about how ordinary families should prevent and respond to door and window glass self-brust.

01. Why does glass self-brust?

Self-brust of tempered glass can be described as the phenomenon of tempered glass breaking automatically without external direct action. What are the specific reasons?

One is self-brust caused by visible defects in the glass, such as stones, sand particles, bubbles, inclusions, notches, scratches, edges, etc. For this type of self-brust, detection is relatively easy so that it can be controlled during production.

The second is that the original glass sheet itself contains impurities – nickel sulfide. During the glass manufacturing process, if bubbles and impurities are not completely eliminated, they may rapidly expand and cause rupture under changes in temperature or pressure. The more impurities and bubbles inside, the higher the self-brust rate.

The third is the thermal stress caused by temperature changes, also known as thermal bursts. In fact, exposure to the sun will not cause tempered glass to self-brust. However, external high-temperature exposure, indoor air conditioning with cool air blowing, and uneven heating inside and outside can lead to self-brust. At the same time, extreme weather such as typhoons and rain can also cause glass bursts.

02. How should door and window glass be selected?

In terms of glass selection, it is recommended to use 3C-certified tempered glass with good impact resistance. Many people may not have noticed this, but in fact, having the 3C logo can already represent to some extent that it is certified as “safe” glass.

Generally, door and window brands do not produce glass themselves but mainly assemble by purchasing glass raw materials. Large door and window brands will choose well-known brands such as China Southern Glass Corporation and Xinyi, with very high safety performance requirements. Good glass, regardless of thickness, flatness, light transmittance, etc., will be even better. After toughening the original glass, the self-brust rate will also decrease.

So when choosing doors and windows, we should pay attention to the brand and try to choose a well-known and high-quality door and window brand, in order to fundamentally avoid the occurrence of door and window quality problems.

03. How to prevent and respond to self-brust of doors and windows?

One is to use laminated glass. Laminated glass is a composite glass product consisting of two or more pieces of glass with one or more layers of organic polymer intermediate film sandwiched between them. After special high-temperature pre-pressing (or vacuum pumping) and high-temperature high-pressure processing, the glass and intermediate film are bonded together.

Even if glass breaks, fragments will stick to the film, and the surface of the broken glass remains clean and smooth. This effectively prevents the occurrence of debris stabs and penetrating falls, ensuring personal safety.

The second is to stick a high-performance polyester film on the glass. Polyester film, commonly known as safety brust-proof film, can adhere to glass fragments to prevent splashing when glass breaks due to various reasons, protecting personnel inside and outside the building from the danger of splashing glass fragments.

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