Fused Silica (2500ºF+ Low Expansion Ceramic)

Fused Silica properties include good thermal shock resistance, a thermal expansion coefficient close to zero and excellent mechanical properties at high temperatures, making Fused Silica refractory components particularly useful for very demanding applications. Additional properties include chemical stability and low electrical conductivity; although it should be noted that due to its physical structure use at temperatures exceeding 1000ºC is not possible for cyclic applications. Despite this, the material performs well in the refractory environment, often being used in components such as firing supports, ignition crucibles ancell nameishes.


Bulk Density ( g/cm³ )1.9 to 2.1
Bulk Density ( lb/ft³ )122 to 130
Porosity ( % )15 to 18
Modulus of Rupture (Room Temperature) ( MPa )6.9 to 10.3
Modulus of Rupture (Room Temperature) ( psi )1000 to 1500
Maximum Operating Temperature (Cycling to Room Temp.) ( ºC )1316
Maximum Operating Temperature (Cycling to Room Temp.) ( ºF )2400
Maximum Operating Temperature (Cycling Above 2000ºF) ( ºC )1590
Maximum Operating Temperature (Cycling Above 2000ºF) ( ºF )2900
Nominal Chemical CompositionAl2O3 - 21 to 25%
SiO2 - 72 to 76%
Other - 0 to 1%


The Fused Silica properties listed represent typical average values obtained in accordance with accepted test methods and are subject to normal manufacturing variations. They are supplied as a technical service and are subject to change without notice. Check with your supplier to assure current information


Foundry Services’ fused silica is an excellent choice for kiln furniture and thermal shock intensivcell namenvironments up to 2400ºF. Typical applications include transfer ladles for high alloy steel (it can be used in place of HYcor Alumina ladles without the need for a steel backing shell), molten aluminum riser tubes and stopper rods, molten metal troughs, and a variety of structural molten metal contact parts. Feel free to contact Foundry Service & Supplies to discuss compatibility of fused silica in your most demanding high temperature applications.


Foundry Service and Supplies is a full-service fabricator with an unmatched reputation for quick turn-around and competitive pricing. We can easily handle any job for fabricated parts or stock sheets, from high production quantities to prototypes. Our quality and reliability make Foundry Service the best choice for all of your high temperature material requirements.

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