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What is the difference between borosilicate glass and ordinary glass?

Click： -Time:2019-08-01 11:13

What is the difference between borosilicate glass and ordinary glass?

Borosilicate heat-resistant glass is a kind of "cooked glass", which is quite expensive and fully meets international environmental testing standards. Due to its own heat resistance and resistance to transient temperature difference, high borosilicate material is used to replace the harmful heavy metal ion components such as lead and zinc in “ordinary glass”, so its brittleness and weight are far less than common in life Raw glass . "

Moreover, it is guaranteed that the explosion does not occur in the case of a sudden temperature difference, which is lighter in weight than the "ordinary glass" containing a large amount of heavy metal ions, and looks different from ordinary glass in appearance. It is separated from the hard, brittle feeling of "raw glass".

1. Raw material composition: The content of borosilicate glass containing boron trioxide and silicon dioxide is higher, the boron content can even reach 14%, and the silicon content reaches 80%. Ordinary flat glass contains about 70% silicon, and ordinary glass generally does not contain boron, but sometimes it can add up to 1%.

2, glass characteristics: Gao Peng glass has a low expansion coefficient, high softening point, good resistance to rapid cooling and rapid heat. Its expansion coefficient is about 32~33*10(-7), ordinary glass is about 80-100*10(-7); resistance to quenching and hot is about 200~300 degrees Celsius.

3. Uses: Mainly used in the production of glass instruments, glass lids, chemical equipment, etc.

Extended information:

Borosilicate glass has a very low coefficient of thermal expansion, about one-third that of ordinary glass. This will reduce the effects of temperature gradient stress and thus have 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 type high borosilicate is 107.6 yd.

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

Optical, borosilicate glass has a low dispersion (approximately 65 Abbes crown glasses) and a relatively low refractive index (the entire visible range is 1.51-1.54).

G3.3 borosilicate glass has a linear expansion coefficient of 3.3 ± 0.1 × 10 -6 / K, and is a glass based on sodium oxide (Na 2 O), boron oxide (B 2 O 3 ), and silicon dioxide (SIO 2 ). The glass component has a high content of borosilicate, which is boron: 12.5 to 13.5%, and silicon: 78 to 80%, so that the glass is called borosilicate glass.

It belongs to PYREX glass in borosilicate glass. It has acid and alkali resistance, water resistance, excellent corrosion resistance, good thermal stability, chemical stability and electrical properties. It has chemical corrosion resistance, thermal shock resistance, good mechanical properties and high temperature resistance.

Ordinary flat glass is also called window glass. Flat glass has the characteristics of light transmission, heat insulation, sound insulation, wear resistance, and weather resistance, and some features such as heat preservation, heat absorption and radiation protection, so it is widely used in windows, walls and interiors of mosaic buildings decoration, etc.

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What is the difference between borosilicate glass and ordinary glass?

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