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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 hold two pieces of quartz glass side by side, you cannot tell them apart.Same color. Same clarity. Same chemical formula: SiO₂.But shine a 193nm deep-UV laser through one of them, and it passes straight through. Shine the same laser through the other, and it's completely absorbed before it even reaches...

Wer schon einmal versucht hat, durch ein Fenster hindurch braun zu werden, kennt die Antwort intuitiv: Normales Glas blockiert UV-Licht. Verwendet man jedoch Quarzglas, dringt UV-Strahlung ungehindert hindurch. Beide Materialien sind für das Auge transparent, basieren auf Siliziumdioxid und sehen im Labor nahezu identisch aus. Warum also blockiert das eine Material ultraviolette...