Heat-resistant borosilicate sight glass
The heat-resistant borosilicate sight glass also called the borosilicate sight glass. It is a kind of heat-resistant sight glass with low expansion coefficient, high softening point and good heat resistance. It can be melted in a tank kiln and can be machined mechanically. It is a good material for producing sight glass such as industrial windows, glass mirrors, boiler sight glasses and pressure container glasses. Most of borosilicate sight glass are colorless and transparent, and some are light yellow.
 
Heat-resistant borosilicate sight glass represents the product of Pyrex7740, belong to this type of China's GG17, Japan Shibata, its expansion coefficient for (32~33) * 1010-7 C -1, thermal shock resistance (2mm) in more than 250 DEG C, the composition is mainly used for the production of sight glass, liquid level meter glass sight glass plate and pressure vessel etc..
Pyrex type sight glass high melting temperature, high viscosity, the viscosity at 1680 DEG C for 101.5Pa s, which in general is difficult in the melting furnace, so the development of China's 95, compared to Pyrex, B2O3, Na2O increased the content of composition of sight glass, decreased Al2O3 and SiO2 content, the melting temperature is to reduce, even in the crucible kiln with two melting also can be melted, but its expansion coefficient increased, in general (39~41) * 10-7 DEG -1, thermal shock resistance decreased, but for some of the lower working temperature of windows can still meet the requirements of the.
Our company's production and processing of heat-resistant borosilicate sight glass introduction:
Product composition:
SiO2:80.5%, B2O3:12.9%, Al2O3:2.4%, Na2O:4.2%
Product performance:
1, density: 2.23g. Cm-3;
2, thermal expansion coefficient (20~300 C): 32 x 10-7 C -1;
3. Acute cold and heat resistance (2mm): 300 C;
4. Water resistance (powder method): 0.019mg. G-1;
5. Acid resistance (weightlessness): 0.16mg. 100cm-2;
6, alkali resistance (weightlessness): 120mg. 100cm-2;
7, the softening point: 820 C;
8, annealing temperature: 560 C;

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