Quartz glass (≥99.99% SiO₂ purity) offers significantly higher temperature resistance (continuous use up to ~1200°C, short-term ~1300°C), an extremely low coefficient of thermal expansion (~0.55 × 10⁻⁶/°C), excellent UV transmission, superior chemical stability, and virtually no metal contamination. Borosilicate glass typically withstands only ~500°C continuous use, has a higher thermal expansion (~3.3 × 10⁻⁶/°C), and is better suited for general laboratory ware rather than semiconductor, high-temperature, or precision optical applications.