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Mullite (3Al₂O₃·2 SiO₂)

Mullite (3Al₂O₃·2 SiO₂), or aluminum oxide-silicon oxide, is present in the form of needles in porcelain. It is a refractory material that is resistant to flame and molten ash, has a low, uniform coefficient of thermal expansion and a heat conductivity only slightly above that of fireclays. Normally, mullite has very fine crystals that, upon prolonged heating, become enlarged and make the product porous and permeable. Prefusing mullite produces larger crystals for more stable high-temperature refractories.
Foamed mullite forms a uniform lattice honeycomb structure for lightweight, heat-resistant structural parts.
Typical Applications

Mullite is the most important constituent of ceramic whiteware, porcelains, and high-temperature insulating and refractory materials. It is used in hot blast stove checker bricks, melting, and firing processes. Other applications include the manufacture of chemical crucibles, electronic substrates, extruding dies, spark plugs, and protective coatings.

Packaging Options



Mullite TSCA (SARA Title III) Status: Listed
Please contact the EPA Office of Chemical Safety and Pollution Prevention (OCSPP) at 202-564-2902.
Fused Zirconium Dioxide CAS Number: 1314-23-4
Aluminum Silicate- Mullite CAS Number 1302-93-8

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