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1.Its characteristic is that the thermal expansion coefficient is small and the optical properties is good. 2.The visible light transmittance is 98%,thermal stability,chemical stability and electrical properties. 3.It also has chemical corrosion resistance,hot resistance to impact and high temperature resistance. 4.The softening point is 815.8°c,coefficient of expansion is 3.3*10-6,high temperature difference is 180°c. 5.borosilicate glass is widely used in high-power shoot lights,stage lights,oven inside wall,large washing and dryer machine windows.