What are the Physical Characteristics of Borosilicate Glass? Borosilicate glass is a type of glass that is mostly composed of silica and boron trioxide. Borosilicate glasses have much lower thermal expansion coefficients than most common glasses (≈3 × 10−6 K−1 at 20 °C), making them very resistant to thermal shocks. Such glass is less thermally strained and can withstand temperature fluctuations of up to 165 degrees Celsius (297 degrees Fahrenheit) without cracking. It's used to make reagent bottles and flasks, as well as lights, electronics, and cookery.
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Physical Characteristics: The most common variety of borosilicate glass used in laboratory glassware has a thermal expansion value of about one-third that of conventional soda-lime glass (3.3 × 10−6 K−1). Fused quartzware is even better in this sense, with one-fifth the thermal expansion of soda-lime glass; however, quartzware is much more expensive due to the difficulty of dealing with fused quartz, and borosilicate glass is a low-cost compromise.