Quartz glass offers superior performance: higher temperature resistance (1680°C vs 500°C), better thermal shock resistance, excellent UV transmission, lower thermal expansion (0.5 vs 3.3 ×10⁻⁶/K), and higher purity (99.99% SiO2). While more expensive, quartz glass is essential for high-temperature and high-purity applications where borosilicate glass cannot perform. Quartz glass also provides better optical transmission in the UV range (down to 185nm vs 300nm for borosilicate), higher chemical resistance to acids and alkalis, and superior dimensional stability at elevated temperatures. The higher cost of quartz glass is justified in applications requiring these superior properties, such as semiconductor processing, high-temperature furnaces, UV systems, and ultra-pure chemical processing. For lower temperature applications (<500°C) where UV transmission is not critical, borosilicate glass may be a cost-effective alternative.