Synthetic quartz glass

Here at Euroglass Instruments, we’ve perfected the technical art of synthetic quartz glass production. Sol-gel technology enables us to manufacture quartz glass without including a melting stage in the process. This unique production method relies on the principle of molding and gelling a liquid at room temperature. A final sintering process densifies the gel body into its final shape.

Using this technology, we are able to manufacture clear and opaque quartz glass products in extremely complex forms. Even very small structures and micro-structured surfaces that achieve very high geometric reproducibility can be easily manufactured.
We offer 4 types of synthetic quartz glass, with specifications listed below.

Overview of the sol-gel method

To produce a sol-gel silica glass part, a cold casting process that relies upon a silicon-containing liquid, sol, results in solid quartz glass. Sol contains the components for a chemical reaction that takes place after the casting that leads to the gelation of the liquid/quartz glass mixture. The resulting gel is already in the final shape of the finished glass piece.
Shrinkage occurs during a subsequent multi-stage drying process, when all of the liquid components of the gel are removed. In this stage, the drying glass piece contains an open-pored silica skeleton called xerogel.
In the final sintering step, the part is thermally compacted into solid, amorphous quartz glass without reaching the melting temperature. The piece is reduced to 50% of the size of the original casting in edge length, with high dimensional accuracy. The properties of the resulting sol-gel silica glass are the same as those of quartz glass manufactured using classical methods.

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  • DIFFUSIL

    SYNTHETIC QUARTZ GLASS DIFFUSIL®

    Diffusil® quartz glass is produced using a special manufacturing process and synthetic raw materials. It is characterized by high chemical purity and special optical properties. Diffusil® has a semi-opaque appearance caused by the homogenous distribution of gas bubbles that are approximately 4 microns in diameter, which act as optical scattering centers. The quantity and size of the gas bubbles can be adapted to customer needs.
    Diffusil® quartz glass is mainly used in optical, analytical and thermal applications.

    Screen Shot 2015 10 17 at 16.02.35 Screen Shot 2015 10 17 at 16.02.42
    Semi-finished and final products of Diffusil® quartz glass SEM-picture of the gas bubbles in Diffusil® quartz glass

    Available product geometries

    • Rods up to max. Ø 25 mm x length 300 mm
    • Sheets up to max. 200 x 150 x 15 mm
    • Discs up to max. Ø 125 mm x height 15 mm
    • Customized geometries, upon request

    Optical Properties

    Screen Shot 2015 10 17 at 15.58.42

    Bubbles / Scattering centers inside the material:
    Diamater: 4±0.5 µm
    Amount:
    Diffusil® UV300 = 300 million pcs / cm³
    Diffusil® UV500 = 500 million pcs / cm³
    Diffusil® UV1000 = 1 billion pcs / cm³
    Diffusil® UV2000 = 2 billion pcs / cm³

    Chemical Properties

    Typical impurities in ppm / weight

    Al Ca Cu Fe K Li Mg Na Ti Zr
    < 2,50 <1,00 <0,02 <0,70 <1,00 <0,05 <0,15 <0,50 <0,20 <0,15


    OH-content: < 300 ppm / weight
    Acid resistance: acc. class 1; DIN 12 116
    Alkaline resistance: acc. class 1; DIN 52 322

    Mechanical Properties

    Density: 2,15 – 2,19 g / cm³ (depending on chosen opacity)
    Porosity: 0,01 – 5% (depending on chosen opacity)
    Young‘s – Modulus: 50 - 54 kN / mm² (depending on chosen opacity)
    Bending strength: 80 – 84 N / mm² (depending on chosen opacity)

    Thermal Properties

    Coefficient of thermal expansion: 5.1 - 5.8 x 10-7 • K-1 (20°C – 500°C)
    Thermal conductivity: 1,24 W / m•K (@20°C)
    1,35 W / m•K (@100°C)
    1,47 W / m•K (@200°C)
    1,70 W / m•K (@400°C)
    1,85 W / m•K (@600°C)
    Softening point: 1.600°C
    Max. working temperature, short termed: 1.200°C
    Max. working temperature, long termed: 1.000°C

    Electrical Properties

    Dielectric constant:
    3,70 (20°C 0….106 Hz)
    3,77 (23°C 9 • 108 Hz)
    3,81 (23°C 3 • 1010 Hz)

    Electrical resistivity:
    1018 Ω • cm (20°C)
    1010 Ω • cm (400°C)
    6,3 x 106 Ω • cm (800°C)

  • Diffusil UV

    Material data sheet

    this data sheet is valid for the following quartz glass grades:

    • Diffusil®UV300
    • Diffusil®UV500
    • Diffusil®UV1000
    • Diffusil®UV2000

    Synthetic Quartz Glass Diffusil®

    Diffusil® quartz glass is produced from synthetic raw materials via a special manufacturing technology. It is characterized by a very high chemical purity and special optical properties. Diffusil® has a translucent, opaque appearance. This is caused by the homogeneously distributed gas bubbles of appr. 4 microns diameter in the glass, which act as optical scattering centers. Amount and size of the gas bubbles can be adapted to customer needs.

    Diffusil® quartz glass is mainly used in optical application areas, especially UV-applications.

    Screen Shot 2015 10 17 at 16.02.35 Screen Shot 2015 10 17 at 16.02.42
    Semi-finished and final products of Diffusil® quartz glass SEM-picture of the gas bubbles in Diffusil® quartz glass

    Available product geometries

    • Rods up to max. Ø 25 mm x length 300 mm
    • Sheets up to max. 125 x 125 x 15 mm
    • Discs up to max. Ø 125 mm x height 15 mm
    • Customized geometries, upon request

    Optical Properties

    Screen Shot 2015 10 17 at 15.58.42

    Bubbles / Scattering centers inside the material:

    Diamater: 4±0.5 µm

    Amount:
    Diffusil® UV300 = 300 million pcs / cm³
    Diffusil® UV500 = 500 million pcs / cm³
    Diffusil® UV1000 = 1 billion pcs / cm³
    Diffusil® UV2000 = 2 billion pcs / cm³

    Chemical Properties

    Typical impurities in ppm / weight

    Al Ca Cu Fe K Li Mg Na Ti Zr
    < 0,15 <0,05 <0,02 <0,05 <0,05 <0,02 <0,02 <0,05 <0,05 <0,05

     

    OH-content: < 0.1 ppm / weight
    Acid resistance: acc. class 1; DIN 12 116
    Alkaline resistance: acc. class 1; DIN 52 322

    Mechanical Properties

    Density: 2,15 – 2,19 g / cm³ (depending on chosen opacity)
    Porosity: 0,01 – 5% (depending on chosen opacity)
    Young‘s – Modulus: 50 - 54 kN / mm² (depending on chosen opacity)
    Bending strength: 80 – 84 N / mm² (depending on chosen opacity)

    Thermal Properties

    Coefficient of thermal expansion: 5.1 - 5.8 x 10-7 • K-1 (20°C – 500°C)
    Thermal conductivity: 1,24 W / m•K (@20°C)
    1,35 W / m•K (@100°C)
    1,47 W / m•K (@200°C)
    1,70 W / m•K (@400°C)
    1,85 W / m•K (@600°C)
    Softening point: 1.600°C
    Max. working temperature, short termed: 1.200°C
    Max. working temperature, long termed: 1.000°C

    Electrical Properties

    Dielectric constant:
    3,70 (20°C 0….106 Hz)
    3,77 (23°C 9 • 108 Hz)
    3,81 (23°C 3 • 1010 Hz)

    Electrical resistivity:
    1018 Ω • cm (20°C)
    1010 Ω • cm (400°C)
    6,3 x 106 Ω • cm (800°C)

  • ReproSil-UV

    Material data sheet

    this data sheet is valid for the following quartz glass grades:

    ReproSil-UV

    Synthetic Quartz Glass "ReproSil"

    ReproSil quartz glass is produced from synthetic raw materials via a special sol-gel route. It is characterized by a very high chemical purity and special optical properties. ReproSil has a transparent and clear appearance. Due to its very low OH-content ReproSil features a unique high optical transmission from the UV- to IR-range without any OH-absorption bands.

    ReproSil quartz glass is mainly used in optical (non-imaging) and analytical application areas, especially UV-applications.

    Available product geometries

    • Rods up to max. Ø 25 mm x length 300 mm
    • Sheets up to max. 125 x 125 x 15 mm
    • Discs up to max. Ø 125 mm x height 15 mm
    • Customized geometries, upon request

     

    Optical Properties

    Screen Shot 2015 10 17 at 16.15.27

    Screen Shot 2015 10 17 at 16.15.36

    Bubble class: 0, acc. DIN 58927
    Refractive index: 1.4770 @ 350nm
    Application: not for imaging applications

    Chemical Properties

    Typical impurities in ppm / weight

    Al Ca Cu Fe K Li Mg Na Ti Zr
    < 0,15 <0,05 <0,02 <0,05 <0,05 <0,02 <0,02 <0,05 <0,05 <0,05

     

    OH-content: < 0.1 ppm / weight
    Acid resistance: acc. class 1; DIN 12 116
    Alkaline resistance: acc. class 1; DIN 52 322

    Mechanical Properties

    Density: 2,20 g / cm³
    Young‘s – Modulus: 70 kN / mm²
    Bending strength: 68 N / mm²

    Thermal Properties

    Coefficient of thermal expansion: 5.1 - 5.8 x 10-7 • K-1 (20°C – 500°C)
    Softening point: 1.600°C
    Max. working temperature, short termed: 1.200°C
    Max. working temperature, long termed: 950°C

  • ZeroSil

    Material data sheet

    this data sheet is valid for the following quartz glass grades:

    ZeroSil (black quartz glass)

    Synthetic Quartz Glass ZeroSil

    ZeroSil quartz glass is produced from synthetic raw materials via a special sol-gel route. It is characterized by a very high chemical purity and outstanding optical properties compared to other well known competitor materials.. ZeroSil has a trhoughout black appearance. This is caused by the homogeneously distributed light absorbing particles of appr. 100nm diamter in the glass. Variation of the particle quantity in the glass matrix can change the light absorbing properties of ZeroSil according to customers specification from deep black to grey. 

    ZeroSil quartz glass is mainly used in optical and thermal application areas.

    Available product geometries

    • Rods up to max. Ø 25 mm x length 300 mm
    • Sheets up to max. 200 x 150 x 15 mm
    • Discs up to max. Ø 125 mm x height 15 mm
    • Customized geometries, upon request

    Optical Properties

    Visual appearance: black
    Bubble class O; acc. din 58927
    Transmission 190 - 3.200nm; <0,15% @ 1mm thickness

    Screen Shot 2015 10 17 at 16.22.56

    Chemical Properties

    Typical impurities in ppm / weight

    Al Ca Cu Fe K Li Mg Na Ti Zr
    < 0,70 <10 <0,05 <4 <0,1 <0,05 <0,70 <1,50 <8 <0,20

     

    Organical Impurities: Carbon (appr. 2.000 ppm/weight)
    OH-content: < 300 ppm / weight
    Acid resistance: acc. class 1; DIN 12 116
    Alkaline resistance: acc. class 1; DIN 52 322

    Mechanical Properties

    Density: 2,20 g/cm3

     

 

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