The difference between borosilicate glass and ordinary glass

The difference between borosilicate glass and ordinary glass
Borosilicate glass (also known as hard glass) is a special glass with high temperature resistance and low expansion coefficient.

It is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance and high chemical stability. Because of its excellent performance, it is widely used in solar energy, chemical industry, pharmaceutical packaging, and electric light sources. , Craft jewelry and other industries.

The good performance of high borosilicate glass has been widely recognized by all walks of life in the world, especially in the field of solar energy, which has been widely used in developed countries such as Germany and the United States.
1 Manufacturing process
Borosilicate glass manufacturing, adding water glass sand, soda water and ground lime with the glaze of boron traditional glass manufacturing. Since borosilicate glass melts at a higher temperature than ordinary silicate glass, some new technologies are needed to enable industrial production.

2 Widely used editing
The fire resistance and physical strength of borosilicate glass make it an ideal choice in the laboratory. It is used to manufacture high-durability glass such as beakers and test tubes in laboratory equipment.

In the middle of the 20th century, borosilicate glass tube coolant was used (usually distilled) to pass high-power vacuum tube-based electronic devices, such as commercial radio transmitters.

Glass cookware is another common usage. A borosilicate glass pie plate is almost an American standard plate. The borosilicate glass measuring cup, with a mark on it to indicate graduation, is also widely used in American kitchens.

Aquarium heaters are sometimes made of borosilicate glass. Due to its high heat resistance, it can tolerate large differences in temperature between water and nickel-chromium alloy heating elements.

Many high-quality flashlights use the borosilicate glass of the lens. This allows a higher ratio of light transmittance compared to plastic and low-quality glass through the lens.

Professional lighters and pipes are made of borosilicate glass. The high heat resistance allows the pipes to tolerate longer periods of use, and these pipes are also more durable.

Most premanufactured glass guitar slides also make borosilicate glass.

The new wire drawing technology enables the application of contemporary art such as glass balls.

Borosilicate glass is sometimes used for high-quality beverage glassware. Borosilicate glass lends kitchenware and glassware increased durability along with microwave and dishwasher compatibility.

Borosilicate is also a material of choice for vacuum tube solar heat utilization technology because of its high strength and heat resistance.

Borosilicate glass has also been found famous for micro-mechanical devices in the micro-electromechanical system, developed and applied in the semiconductor industry as part of the etched wafer stack of bonded etched borosilicate glass.

The insulation tiles on the space shuttle are coated with borosilicate glass. Lighting equipment manufacturers use its refracting borosilicate glass.

Its main performance indicators have reached international ISO standards, and are of the same material properties as the 7740 material from Corning in the United States and the 50 material from Schott in Germany. Compared with common glass, it has no toxic and side effects. Its mechanical properties, thermal stability, water resistance, alkali resistance, acid resistance and other properties are greatly improved. It can be widely used in various fields such as chemical industry, aerospace, military, household, hospital, etc. Various products such as lamps, tableware, standard plates, telescope pieces, washing machine observation holes, microwave oven plates, solar water heaters, etc., have good promotion value and social benefits. The appearance of this kind of glass in China is another new revolution in the basic material industry.

The main materials of solar water heaters and vacuum collector tubes mainly use their good light transmittance, good mechanical properties and good impact resistance. The low-iron glass used by some manufacturers lacks the above properties, and is different from high borosilicate in weight and appearance. (The color is dark and light. Generally small manufacturers use more)



3 feature editing
Borosilicate glass has a very low coefficient of thermal expansion, about one third of that of ordinary glass. This will reduce the stress caused by temperature gradient


Influence, which has 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.

Borosilicate glass begins to soften at about 821 ℃ (1510 ℉). At this temperature, the 7740-type high-viscosity borosilicate is 107.6 weights.

Borosilicate glass is less dense than ordinary glass.

Although more and more resistant to thermal shock than other types of glass, borosilicate glass can still be broken due to rapid or uneven temperature changes. When broken, the borosilicate glass cracks tend to be larger, rather than shattered (it will unit, not split).

Optical, borosilicate glass has low dispersion (approximately 65 Abbe number glasses) and relatively low refractive index (the entire visible light range 1.51-1.54).

The linear expansion coefficient of G3.3 high borosilicate glass is 3.3±0.1×10-6/K. It is a glass with sodium oxide (Na2O), boron oxide (B2O3) and silicon dioxide (SIO2) as the basic components. The borosilicate content of the glass composition is relatively high, namely boron: 12.5~13.5%, silicon: 78~80%, so this type of glass is called high borosilicate glass. It belongs to PYREX glass in borosilicate glass [1]. It is resistant to acid, alkali, water, corrosion resistance, and has good thermal stability, chemical stability and electrical properties, so it has the characteristics of chemical resistance, thermal shock resistance, good mechanical properties, and high temperature resistance.

Post time: Dec-23-2020