Opaque Fused Quartz Category

OPAQUE FUSED QUARTZ

 

 

The opaque quality comes from quartz sands of high purity when reduced to a molten state at a temperature of approximately 2000° C. The high temperature produces a vitreous material characterized by the presence of a multitude of gaseous micro-bubbles. These bubbles diffract light, giving the material its opacity. The term opaque silica is mainly used for molded or centrifuged parts, while the product obtained by drawing is normally referred to as translucent.

Opaque silica glass offers a number of exceptional properties, such as:

  • Extreme Hardness
  • Low Expansion
  • Excellent High Temperature Resistance
  • Maximum Continuous Temperature 1100° C
  • Extreme Chemical Purity
  • Excellent Corrosion Resistance
  • Excellent Electrical Insulation Properties
  • Remarkable Stability Under Atomic Bombardment

 

MECHANICAL PROPERTIES

     
Specific Density (according to fusion process)          1.98 to 2.12
Hardness (Mohs scale)     6
Rupture stress: traction N.m-2 2.107
  compression N.m-2 5.108
       
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ELECTRICAL PROPERTIES

     
Dielectric constants        3.5
Dielectric rigidity V.m-1 5.106
Loss coefficients at 1 MHz   20.10-4
     
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THERMAL PROPERTIES

     
Linear expansion coefficient  K-1 5.4.10-7
Specific heat at 20° C J.kg-1. K-1 7.5.102
Heat conductivity at 20° C W.m-1. K-1 1.05
Annealing point ° C 1120
Softening point ° C 1460
       
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CHEMICAL PROPERTIES

       
SiO2 content       % 99.8
Element content (typical analysis) Fe ppm 14
  Ti ppm 100
  Al ppm 550
  Ca ppm 40
  Mg ppm 11
  Na ppm 25
  K ppm 20
  Li ppm 5
       
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Opaque Fused Quartz Labware & Trays

 

COMBUSTION BOAT WITH HANDLE

RECTANGULAR TRAYS

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