Fused Silica - SiO2

Fused Silica Windows, Wafers and Substrates

Fused silica is high purity synthetic amorphous (non-crystalline) silicon dioxide (SiO2). It is formed by chemically combining Silicon and Oxygen, and is not to be confused with fused quartz which is derived from melted quartz crystals or silica sand. Because of its low thermal expansion coefficient and exceptional transmittance over a wide spectral range (especially in the UV), optical grade fused silica is an ideal material for thin precision UV optical windows, MEMS wafers, and optoelectronic substrates. Fused Silica's high purity enables it to withstand and transmit high energy laser pulses without significant absorption or damage to the material. Fused silica is also easily machinable and can be superpolished to < 7 angstroms surface roughness.

Key Fused Silica (SiO2) Properties:

  • Excellent UV transparency
  • High thermal shock resistance
  • Good chemical inertness
  • Low dielectric constant
  • Low dielectric loss
  • Very low thermal expansion
  • High melting point
  • Scratch resistant


Fused Silica wafers and fused silica substrates commonly available from stock:

  • 100mm diameter x 1mm thick
  • 100mm diameter x .5mm thick
  • 125mm diameter x 1mm thick
  • 125mm diameter x .5mm thick
  • 150mm diameter x 1mm thick
  • 150mm diameter x .5mm thick
  • 2" square x 1mm thick
  • 2" square x .625mm thick
  • 2" square x .5mm thick

Please call or e-mail for a quotation to meet your requirements.

Valley Design also offers precision machining services such as lapping, polishing, dicing, grinding, wafering, slicing, bonded wafer thinning of various other materials including Alumina, Aluminum Nitride, Ceramics, Sapphire, Crystals, Metals, Glass, Quartz and many others. Many materials in stock. Valley manufactures stock and custom substrates, wafers, windows, die, flat optical components and vacuum chucks for a variety of applications including Semiconductor, Medical, Aerospace, Photonics and Research. Incorporated for over 30 years, the company is ISO 9001-2008 certified and operates 30,000 sq. ft. of facilities on both East and West Coasts.






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Valley Design East
Phoenix Park Business Center
2 Shaker Road, Bldg. E-001
Shirley, MA 01464
Phone: 978.425.3030
Fax: 978.425.3031
Valley Design
Santa Cruz, CA 95060  
Phone: 831.420.0595  
Fax: 831.420.0592

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