High borosilicate glass (also known as hard glass) is characterized by the use of glass to conduct electricity at high temperatures. The glass is melted by heating inside the glass and processed by advanced production processes. The coefficient of thermal expansion is (3.3 ± 0.1). ) × 10-6 / K, also known as "borosilicate glass 3.3".
It is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance and high chemical stability. Due to its excellent performance, it is widely used in solar energy, chemical industry, pharmaceutical packaging, electric light source. , craft jewelry and other industries.
Borosilicate glass has a very low coefficient of thermal expansion, about one-third that of ordinary glass. This will reduce the stress caused by temperature gradient
Influence, thus having stronger fracture resistance. Due to its very small shape deviation, this makes it an indispensable material in telescopes and mirrors. It can also be used to treat high-level nuclear waste.
The borosilicate glass begins to soften at about 821 ° C (1510 ° F), at which temperature the 7740 viscosity borosilicate is 107.6 yoke.
Second, the difference between heat-resistant glass and general glass
1. Different raw materials
Heat resistant glass is different from ordinary glass. Contains high temperature resistant boric acid. Can adapt to great temperature differences. Tempered glass is a glass that is surface tempered for general tempered glass. Small cracks or extreme temperature differences can cause cracking.
2, different manufacturing processes
The heat-resistant glass is a glass which is produced at a temperature 200 ° C to 300 ° C higher than the tempered glass and which contains boric acid and is resistant to extreme heat and freezing temperatures. Therefore, the production is difficult and the manufacturing cost is 2-3 times higher (the thermal shock of this product is above 120 °C)
3, different uses
Heat-resistant glass can withstand extreme temperature changes, so it can be used not only in microwave ovens, ovens, but also in refrigerators.
4, different security
In the state where the surface of the tempered glass has small cracks, there may be a danger of scattering of the glass sheet when subjected to thermal shock or external impact, and the high borosilicate is a safer heat-resistant glass, and there is no danger of scattering of the glass sheet. .
Third, the wide application of high borosilicate glass
The refractory properties and physical strength of borosilicate glass make it ideal for use in laboratories, and it is used in laboratory equipment for the manufacture of high durability glass such as beakers and test tubes. In addition, the minimum exposure of the borosilicate glass bend allows the volume of the borosilicate heat-resistant container to provide an accurate measurement over time.
Glass cookware is another common usage, and a borosilicate glass pie plate is almost an American standard plate. It is also widely used in American kitchens.
Aquarium heaters are sometimes out of borosilicate glass. Due to its high heat resistance, it can tolerate a large difference in temperature between water and nichrome heating elements.
Many high quality flashlights use borosilicate glass for the lens. This gives a higher ratio of light transmission through the lens than plastic and low quality glass.
Professional lighters and pipes are made of borosilicate glass. The high heat resistance allows the tube to be tolerated for a longer period of time, and these pipes are also more durable.
Borosilicate glass is sometimes used in high quality beverage glassware. Borosilicate glass lends durability to kitchen utensils and glassware with microwave and dishwasher compatibility.
The insulation tiles on the space shuttle are coated with borosilicate glass. Lighting manufacturers use their refractive borosilicate glass.
Solar water heaters, the main materials of vacuum collectors, mainly use their good light transmission, good mechanical properties and good impact resistance.
Fourth, borosilicate glass does not contain heavy metal substances
The main component of borosilicate glass is boron and silicon. The content of boron is 12.5-13.5%, and the silicon content is 78-80%. Therefore, the acid resistance and alkali resistance and alkali resistance of borosilicate glass are also very superior. Therefore, the high borosilicate itself does not contain toxic substances, and the high temperature resistance and acid and alkali resistance of the high borosilicate make it difficult for the high borosilicate to precipitate substances harmful to the human body in daily drinking water use.
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