After the toughened glass is broken, the fragments will be broken into uniform small particles without the sharp corners of ordinary glass knives, so it is called safety glass and is widely used in automobiles, interior decoration, and opening windows on high floors. After the glass is broken, the sharp knife-like sharp corners can easily cut children or hitters, causing personal injury. After the glass is broken, it becomes small particles or knife-shaped. This is the main difference between tempered glass and general glass. But in engineering inspection, it is unrealistic to choose this kind of destructive inspection.

Tempered glass is glass made by rapidly cooling the cooling medium such as high-speed air when the glass is uniformly heated to the softening temperature. There is uniform compressive stress on the surface of this glass, which can improve the mechanical strength and thermal shock resistance of the glass. When using air as cooling medium, it is called tempering; when using oil and other liquids as cooling medium, it is called liquid tempering; when using molten salt as cooling medium, it is called salt bath tempering. According to the degree of rigidity and product shape,Shaped glassCustomized, it can be divided into thorough tempering, regional tempering, semi-tempering, flat tempering and bending tempering.

In recent years, special-shaped glass processing plants have adopted new tempering processes, such as roller table or air cushion flat tempering; developed new cooling media, special-shaped glass, such as adding special solid media and highly volatile liquids to compressed air As well as the selection of silicone oil medium and solid contact method, etc., the cooling efficiency of the cooling medium is greatly improved, and thin glass 1. 7 ～ 3 mm can be tempered and the glass strength can be further improved Reduce your own weight. Special-shaped glass is a kind of glass that can work safely and continuously in a high-temperature environment (generally referred to as a hot air field, a hot fluid, an open flame, and a high-temperature molten material). Its use function does not change due to the external environment. Because the processing of shaped glass has the characteristics of high temperature resistance, high mechanical strength, high light transmittance, heat resistance and stability, and stable chemical function, it is widely used in production and living areas. The usefulness of shaped glass can be divided into the following aspects.

　　1. Industrial sight glass

In the processing and production of industrial special-shaped glass, it is often necessary to observe the reaction status of the production material, the active status or the stable combustion status in the heating equipment. This requires the use of industrial sight glass to investigate at high temperatures in order to master the production process. The high-temperature glass used for investigation generally includes pipeline sight glass, container sight glass, flange sight glass, boiler sight glass, survey window glass, peephole glass, high-temperature view glass, etc. It is mainly used in power, metallurgy, casting, printing , Petrochemical, machinery manufacturing, medicine, etc.

　　2. Heat source baffle

Some processing techniques in the production of special-shaped glass often generate a lot of heat. At this moment, high-temperature glass can be used as a baffle to maintain the operator. For example, in some foundry processing plants, it is necessary to use high-temperature glass to block the molten material.

　　3. Liquid level indication

This is a special-shaped glass professionally used to indicate the liquid level. It has the function of high temperature resistance and high pressure resistance. It is mainly used for the investigation of liquid level, water level, oil level, etc. of boilers, tanks, containers, etc. Two-color, triangular prism, etc.

　　4. Heating equipment accessories

This is a special-shaped glass for heating equipment such as ovens, ovens, fireplaces, etc. The high-temperature glass of the oven is mainly used to investigate the condition of the substances in the oven. The high-temperature glass of the fireplace can not only prevent smoke and dust from entering the room, but also transfer heat.