CLEAR CRYSTAL FUSED QUARTZ ROD

The Difference between Fused Silica and Quartz Glass

While used for similar applications, fused silica and quartz glass have key differences. Consider this.

According to AZO Materials:

“This synthetic material, normally referred to as synthetic fused silica, has better optical properties and is somewhat more expensive than the other type.

“In the UK, terms such as quartz, silica, fused quartz and fused silica tend to be used interchangeably. In the USA, quartz refers to material melted from grains, silica refers to the synthetic material.

Advantages of Fused Silica/Quartz Glass

“The advantages of fused silica or quartz glass include:

  • Incredibly thermally shock resistant (can be taken from red heat and plunged into water without cracking)
  • Low coefficient of thermal expansion
  • Optical transmission properties from ultra violet to infra red
  • Good chemical resistance
  • Excellent electrical insulator

Applications of Fused Silica/Quartz Glass

“Applications Applications of fused silica/quartz glass include:

  • Windows
  • Lenses
  • Mirror substrates
  • Crucibles, trays and boats
  • UV transmitting optics (synthetic fused silica)
  • IR transmitting optics
  • Metrology components

Properties of Fused Silica/Quartz Glass

Table 1. Typical properties of fused silica/quartz glass.

Property
Units
Value
GeneralChemical Formula
n/a
SiO2
Density
g/cm3
2.23
MechanicalDesign Tensile Strength
MPa
48
Design Compressive strength
MPa
1100
Young’s Modulus
GPa
72
ThermalMax. Use Temperature
°C
950-1300
Thermal Conductivity
W/m.K
1.4
Co-Efficient of Linear Expansion
10-6/°C
0.55
ElectricalVolume Resistance
Ù.cm
1016
Dielectric Constant
 
3.7
Dielectric Strength
kV/mm
40

Figure 1. Transmission curve for 10mm thick fused silica/quartz glass (including surface reflection losses).

“Properties of fused silica/quartz glass shown are typical values, they are not absolute material properties, and should be used for guidance only. It is recommended that materials and components are tested for their suitability for a specific application.”

Original Source