Heat resistance of borosilicate sight glass

Heat resistance of borosilicate sight glass
Sight glass are bad conductors and brittle materials. We often see the sight glass burst. But the 3.3 sight glass is different. Because of the three oxidation of twelve point seven percent of the two boron in the chemical composition, the thermal stability of the glass is greatly improved. In accordance with the regulations of ISO3587, 3.3 sight glass are heated to 140 in the oven. C, constant temperature for 30 minutes. Take it out immediately and put it in 20. C water, sight glass will not burst. This index is called the heat shock temperature. ISO3587 stipulates that 3.3 glass mirror products are less than 100mm, and the heat shock temperature is not less than 120 C; 3.3 glass products are greater than 100mm, and the heat shock temperature is not less than 110. C. This means that the glass mirrors are heated by 140. C or 130. C, suddenly met 20. C cold water, no glass mirror burst. In the actual use of the process, this is very rare. As people know that hot sight glass are afraid of cold water, they usually do not put cold water on the hot sight glass. In the production of sight glass equipment, the temperature is more than 120. The C is a lot, heated to 100 with a glass device. Above C, to special protection, not to engage in cold water to go to the top of glass will not happen burst, this in ISO3587 are described.
The cold and thermal expansion of the glass view mirror is very small. Take the 10m long tube for example, the temperature increases 50K, the elongation value of the glass tube is equal to 1, the steel is 3.6, and the polyethylene is 62.5. Therefore, the glass pipe can not even be used as a telescopic compensator.

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