High borosilicate glass (also known as hard glass) , due to the coefficient of thermal expansion coefficient (3. 3, 0. 1) x10-6/K, also known as borosilicate glass 3. 3". It is a special glass material of low expansion rate, high temperature resistance, high strength, highhardness, high transmittance and high chemical stability, because of its excellent properties, is widely used in solar energy, chemical industry,
pharmaceutical packaging, electric light, craft accessories industry. Its good performance has been widely recognized by all circles of the
world, especially in the solar energy field.The developed countries such as Germany, America and the United States have already carried out
more extensive promotion.
Many high quality flashlights use lenses of borosilicate glass. This makes the ratio of transmittance higher than that of plastic and low
quality glass by lens. The new drawing technique enables the use of glass balls and other contemporary art. The modern glass art movement, led by the rapid development of borosilicate glass in 80s and 90s in the Nuosisita century color palette is provided, borosilicateglass suppliers broad economic growth. Borosilicate is commonly used in drawing glass blown forms and artists have created range of products ranging from
jewelry and kitchenware to sculpture as well as art 70955. Borosilicate glass is sometimes used in high-quality glassware.
Borosilicate glass lends itself to increased durability with microwave ovens and dishwasher compatible Kitchenware and glassware.
Most telescope reflector components are made of glass because of its coefficient of thermal expansion with low borosilicate glass. This allows very accurate optical surfaces that may very little with temperature, and matches the glass mirror assembly, "tracks" changes in temperature, and preserves the characteristics of the optical system. The most common optical glass lens manufacturing tool used by the Schott shoal - 7 (or equivalent from other manufacturers) , a very fine borosilicate glass crown. It is also designated 517642 glass after 1. 517 refractive index and Abbe number 64. 2. Other more expensive borosilicate glass, such as Schott, B270, or equivalent, can be used in the manufacture of "crown glass" eyeglass lenses. The cost of ordinary borosilicate glass, which is used to make Kitchenware and even reflective telescope reflectors,
can not be used to cope with this type of glass, lower grade, high quality lens due to stripes and inclusions.
Borosilicate is also a material for selecting solar heat utilization technology of vacuum tubes, because of its high strength and heat resistance.
characteristics
Borosilicate glass has a very low coefficient of thermal expansion, which is about 1/3 of that of ordinary glass. This will reduce the effect due to temperature gradient stress and thus have stronger fracture resistance. G3. 3 borosilicate glass linear expansion coefficient is 3. 3 +
0. 1 * 10-6/K (Na2O) , with sodium oxide and boron oxide (B2O2) and silica (SIO2) as basic elements of a glass.
The content of boron and silicon in the glass component is higher, which are boron, 12. 5~13. 5% and silicon: 78~80%, so this kind of glass
is high borosilicate glass. PYREX glass in borosilicate glass. Acid, alkali, water, corrosion resistance is superior, has good thermal stability, chemical stability and electrical properties, it has a chemical resistance, thermal shock resistance, mechanical properties, and withstand high
temperature and other characteristics.
High borosilicate glass high borosilicate glass has very low thermal expansion coefficient, high temperature resistance and 200 degree temperature change. High boron silicon glass used in electrical equipment heat reflective halogen lamp and lamp must use heat-resistant glass,
such as microwave oven, microwave oven turntable special glass lampshade, stage light reflecting cup, drum washing machine observation window, glass teapot teacup, solar collector etc. .