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Fused Silica / Quartz Glass

Fused silica, also known as quartz glass, is the purest type of glass available. It is produced from pure silicon dioxide (SiO₂) without the addition of other oxides. This gives fused silica its exceptional properties: it is extremely heat-resistant, chemically inert, and optically highly transparent.

Fused silica (quartz glass) is used in applications where no compromise is acceptable, such as in the semiconductor industry, optics, laser and UV technology, scientific instruments, and high-end lighting. Thanks to its unique combination of transparency, stability, and purity, fused silica belongs to the absolute top tier of technical glass materials.

Applications

Fused silica is used in:

  • Optical and scientific instruments (lenses, prisms, windows)
  • UV and IR applications (such as spectrometers and exposure systems)
  • Semiconductor manufacturing and laboratory equipment
  • Protective windows for lasers and high-temperature processes
  • Precision components in aerospace applications

Technical specification

Optical Properties

The optical quality of fused silica (quartz glass) is unmatched. Due to its extreme purity and homogeneity, it provides excellent light transmission across a very wide spectrum, from deep UV (around 185 nm) to far into the infrared (up to approximately 3500 nm).

Optical parameters:

  • Light transmission: average> 90%
  • Spectral range: approx. 185 nm – 3500 nm (UV → IR)
  • Refractive index: 1.458 (lower than borosilicate and float glass)
  • Color rendering: completely neutral, with no green tint or discoloration
  • Optical homogeneity: outstanding, ideal for lasers, optics, and metrology

Thanks to these characteristics, fused silica is the material of choice for applications that demand maximum light transmission, precision, and temperature stability, such as UV lighting, optical filters, laser windows, and scientific projection systems.

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