Introduction to the Global Fused Silica Market Fused silica, a high-purity, non-crystalline form of silicon dioxide (SiO₂), is a critical material widely used across advanced industries such as semiconductors, telecommunications, specialty optics, and photonics. Its exceptional thermal stability, low thermal expansion, and superior optical transparency make it indispensable for high-performance applications. The Fused Silica Prices landscape in 2025 has been shaped by fluct