SQ Fused Silica

SQ Fused Silica

SQ Fused Silica

Ultrapure Synthetic Fused Silica

The fused, cooled, and polished SQ Fused Silica ingots are classified into various quality grades according to acknowledged measurement and selection procedures, and can be supplied in accordance with individual customer requirements. This means the Fused Silica can be deployed across an optical application spectrum from DUV to NIR.

  • SQ Fused Silica as a polished ingot section or semi-finished product (disc, rod, plate, block, etc.) in five quality grades in terms of homogeneity, absence of striae, and application wavelengths
  • Product versatility (includes rods, discs, plates, blocks, prisms) due to manufacturing technology used.
  • Fused Silica free of inclusions and bubbles, for laser and optical applications
  • Extremely low fluorescence and excellent laser stability due to its high OH and H2 content
  • Available with documented optical properties
    • High homogeneity
    • Low stress birefringence
    • High transmission @193 nm and @248 nm

Range of products and services

Quality grades SQ Fused Silica

(as per customer-specific requirements)

  • SQ0: A 3D material that is free of striae and striations in any functional direction. Recommended for optical elements utilizing multiple light directions, such as prisms or high-curvature lenses.
  • SQ1: A 1D material with high homogeneity and free of striae and striations in the functional direction. Typical applications include optical elements such as lenses, discs, plates, wafers, and rods/fibers.
  • SQT: Not specified in terms of homogeneity, striae, and striations. This quality grade is recommended for technical applications.
  • Excimer-grade Fused Silica – available as SQ1 or SQ0: excellent transmission at 193 nm / 248 nm. Lowest level of laser-induced fluorescence (LIF)
    • SQ0-E193/SQ1-E193 (ArF excimer-grade)
    • SQ0-E248/SQ1-E248 (KrF excimer-grade)

Product properties SQ Fused Silica

Virtually free of inclusions and bubbles, the material features an outstanding set of optical and physical properties:

  • Laser durability
  • Refractive index homogeneity
  • Thermal stability and temperature shock resistance
  • Low stress birefringence
  • Low thermal expansion coefficients

Due to its high OH and H2 content, our Fused Silica exhibits extremely low fluorescence and excellent stability under high-energy UV and laser radiation.

Ordering options SQ Fused Silica

  • Various geometries
  • 5 quality grades
  • Surface quality/finishing

Fields of use

  • Excimer laser optics and beam guiding systems
  • DUV and UV optical components
  • Optical material in line beam systems used in OLED manufacturing
  • UV rods, preforms and optical fibers
  • Laser fusion
  • For Fused Silica vessels and windows in technical applications
  • Lithography and microlithography applications: stepper lenses, photo mask blanks, wafers and lithography optics


Please contact us for further information. We look forward to your inquiry.

Europe, Africa, and Asia (excl. China)
Phone +49 36764-81-100
Email sales-europe@weinert-industries.com

Phone +86 519-8988-7783
Email sales-china@weinert-industries.com 

North and South America
Phone +1 757-258-4805
Email sales-americas@weinert-industries.com

Sales Network
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Frequently Asked Questions about SQ Fused Silica

1. What is Fused Silica and how does it differ from Fused Quartz?

Fused Silica and Fused Quartz are two terms often used interchangeably, but they actually possess distinct definitions and properties. Fused Silica is synthesized by the oxidation of high purity silicon. This process results in a material made up almost entirely of Silicon Dioxide (SiO2), also known as pure silica. On the other hand, Fused Quartz is produced by melting naturally occurring crystalline quartz. Both materials are types of silica glass, known for their exceptional resistance to thermal shock and their high working and melting temperatures.

2. What are Fused Silica Fibers and what are their applications?

Fused Silica Fibers, often used in fiber optics, are thin strands of Fused Silica glass. These fibers have remarkable properties such as low thermal expansion and excellent optical clarity, which make them ideal for use in telecommunications, data communications, and sensing applications. They are the backbone of optical fiber technology, capable of transmitting data over long distances with minimal loss.

3. How do the properties of Quartz Glass compare to other materials?

Quartz Glass, often referred to as fused quartz or fused silica glass, is an extraordinary material for numerous industrial applications due to its unique properties. These include excellent ultraviolet (UV) transmission, low coefficient of thermal expansion, resistance to chemical attacks, and superior optical properties. Compared to other glasses or materials, Quartz Glass can withstand higher temperatures and has better chemical resistance, making it ideal for various high-temperature applications like semiconductors and lighting.

4. What are the different grades of Fused Silica and how do they affect its uses?

Fused Silica comes in various grades that differ in their purity, homogeneity, and optical clarity. These grades determine the suitability of the Fused Silica for different applications. For instance, high-grade synthetic Fused Silica is often used in industries like semiconductor manufacturing and optics where extreme precision is required. In contrast, lower grade Fused Silica, while still having excellent thermal properties, may be used in applications where high optical clarity is less crucial.

5. How does the process of creating Synthetic Quartz Glass differ from that of creating Fused Quartz?

Fused Quartz is produced by melting naturally occurring quartz crystal at high temperatures, while Synthetic Quartz Glass is manufactured using a chemical process. This process, called the hydrothermal process, involves dissolving Silicon Dioxide in water at high pressure and then re-depositing it at a lower pressure to form quartz. Synthetic Quartz Glass is generally purer than Fused Quartz and is often used in applications requiring high purity, like the semiconductor industry or precision optics.
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