What kinds of safety glass are there?
Classification：Industry Time：2022/2/15 views：1590
Safety glass is mainly a collection of composite standard glass materials customized and produced according to national or international requirements. At present, there are mainly four kinds of safety glass on the market (general name)
Safety glass is mainly a collection of composite standard glass materials customized and produced according to national or international requirements. At present, there are mainly four kinds of safety glass on the market (general name):
Tempered glass: glass with compressive stress on the surface, also known as strengthened glass / annealed glass; The glass is mainly strengthened by physical / chemical tempering method.
Laminated glass: laminated glass is sandwiched between two or more pieces of glass with one or more layers of organic polymer intermediate film (such as PVB / SGP); The processing technology is: composite glass products that permanently bond the glass and the intermediate film into one after high-temperature preloading / evacuation of the autoclave and high-temperature and high-pressure process treatment.
Semi toughened laminated glass: it is a kind of prestressed glass made of ordinary flat glass after reprocessing. Semi toughened glass is not easy to break. Even if it is broken, it will break in the form of particles without acute angles, greatly reducing the harm to human body.
Toughened laminated glass: it is a kind of laminated glass, which is composed of two or more layers of ordinary float glass after toughening.
The price of laminated glass is relatively high. Generally, the price of 5mm thick laminated glass is 130 yuan per square meter; The tempered glass is relatively cheap, with the same thickness of 5mm, and its price is only 50 yuan per square meter.
When the toughened glass is broken, the whole glass is broken into small particles, which is not easy to hurt people. Nevertheless, once broken, this kind of glass can not prevent the penetration of the glass impactor and fall to the ground. If the fragments do not fall from a very high place, the damage of the glass fragments to the people and property below will be reduced to a small extent because the glass fragments are small and harmless.
When the laminated glass is broken, it will firmly adhere to the transparent bonding material without splashing or falling. If the full outer frame is added when using this kind of glass, when the impact leading to the rupture is not particularly strong, the fragments will remain in the frame without splashing, and it can also prevent wind and rain in a short time, so that people and objects inside the building will not be damaged.
Semi toughened laminated glass is a semi toughened laminated glass formed by two pieces of semi toughened glass. When this kind of glass is broken, the glass will be broken into the same large pieces as annealed glass. However, after the glass breaks, the glass fragments will firmly adhere to the transparent bonding material without splashing or falling. Similarly, if the glass has a full frame and the impact leading to fracture is not very strong, the possibility of large pieces falling is also relatively small.
Toughened laminated glass is a toughened laminated safety glass formed by two pieces of toughened safety glass through interlayer. When broken, the glass will break into small obtuse angle particles. The fragments will be firmly adhered to the transparent bonding material, which is not easy to hurt people. However, when two pieces of glass are also broken, the whole laminated glass may fall out of the frame.
In contrast, float flat glass, single semi tempered glass (heat strengthened glass) and single wire glass do not belong to safety glass. When they are broken, the crack of the whole piece of glass extends from the hit point to the edge, forming radial scattered pieces. The fragments are sharp and easy to hurt people.
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