The difference between high borosilicate sight glass and ordinary sight glass

The difference between high borosilicate sight glass and ordinary sight glass

The difference between high borosilicate sight glass and ordinary sight glass:

Borosilicate sight glass has a very low coefficient of thermal expansion, about one-third of ordinary sight glass. Therefore, it has stronger resistance to fracture. Borosilicate sight glass is denser than ordinary sight glass. Borosilicate sight glass can still be broken due to rapid or uneven temperature changes. When broken, borosilicate sight glass cracks tend to be larger, rather than crushed (it will unit, not split).

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1. Characteristics of high borosilicate sight glass

Borosilicate sight glass has a very low coefficient of thermal expansion, about one-third of ordinary sight glass. This will reduce the influence caused by temperature gradient stress and thus have stronger resistance to fracture. Due to its very small shape deviation, it makes it an essential material in telescopes and reflectors. It can also be used to treat highly radioactive nuclear waste.

The borosilicate sight glass begins to soften at about 821 ° C (1510 ° F). At this temperature, the high viscosity borosilicate Model 7740 has a weight of 107.6.

2. The borosilicate sight glass is denser than ordinary sight glass

Although more and more resistant to thermal shock than other types of sight glass, borosilicate sight glass can still break due to rapid or uneven temperature changes. When broken, borosilicate sight glass cracks tend to be larger, rather than crushed (it will unit, not split). Borosilicate sight glass has low dispersion (approximately 65 Abbe number crown sight glasses) and relatively low refractive index (over the entire visible light range 1.51-1.54).

3. High borosilicate sight glass is used for reflective heat-resistant lamp cups of halogen lamps and electrical equipment that must use heat-resistant sight glass, such as microwave special sight glass turntables, microwave lampshades, stage lighting reflector cups, drum washing machine observation windows, heat-resistant teapots, Solar collector tubes, etc.

2. The linear expansion coefficient of G3.3 high borosilicate sight glass is 3.3 ± 0.1 × 10-6 / K, which is based on sodium oxide (Na2O), boron oxide (B2O2), and silicon dioxide (SIO2). sight glass. The content of borosilicate in the sight glass component is relatively high, namely boron: 12.5 ~ 13.5%, silicon: 78 ~ 80%, so this kind of sight glass is called high borosilicate sight glass. It belongs to PYREX sight glass in borosilicate sight glass. Acid, alkali and water resistance, excellent corrosion resistance, 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.

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