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Borosilicate glass and fused silica both handle heat better than ordinary glass, but they're not interchangeable. Fused silica pushes every one of borosilicate's advantages further — at a meaningfully higher price. Key Comparison Property Borosilicate Glass Fused Silica Composition SiO2 + B2O3 (+ minor oxides) 99.9%+ pure SiO2 Thermal expansion coefficient ~3.3...

If you've ever tried to get a suntan through a window, you already know the answer intuitively: ordinary glass blocks UV light. But swap that window for quartz glass, and UV passes straight through. Both materials are transparent to the eye, both are based on silicon dioxide, and both look nearly identical...