Refractories

Refractories are flours and stuccos for building a slurry and ceramic shell. R&R offers aluminosilicates, fused silica, tabular alumina and zircon to meet your specific needs.

ranco-sil-flour
Ranco-Sil

Ranco-Sil™ Fused Silica
RANCO-SIL fused silica is electrically fused, high purity silica. Fused silica has a low thermal conductivity and excellent thermal shock resistance. These properties, along with its low density, make it an excellent refractory for use in a ceramic shell mold. RANCO-SIL fused silica is available in flour and granular forms. RANCO-SIL fused silica can be used throughout the ceramic shell. When used in the primary slurry, it may be necessary to blend with zircon depending on the alloy. Shells constructed with fused silica hold their dimensions better and are not prone to hot deformation or bulging. Shell removal from the casting, or knockout, is also easier with fused silica refractories.

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alumina silica

Aluminosilicate
Aluminosilicate is produced from a naturally occurring mineral, calcined mullite, that is precisely sized as either flour or grain. It is available in three alumina contents: 47%, 60% and 70%. The standard alumina content in the investment casting industry is 47%; which provides a very economical and consistent product. These products are low in iron, alkaline and alkaline earth elements. In the investment casting industry, the main use of aluminosilicate is in backup slurries and as a backup stucco. A wide variety of grain and flour sizes are available to fit your needs.

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alumina silica

R&R® Euro-Sil™ Aluminosilicate
Aluminosilicate is produced from a naturally occurring mineral and is therefore subject to variability.

R&R EURO-SIL aluminosilicate is produced in Europe. For more information, contact European Sales Support.

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zircon-flour
Zircon

Zircon
Zircon is a naturally occurring refractory mineral. It is chemically inert and is stable to very high temperatures. Zircon has a very high thermal conductivity and acts as a chill to eliminate metal mold reactions and burn-in resulting in a smooth cast surface. Zircon is available in both flour and granular form. Zircon is almost exclusively used in the primary slurry and as a primary stucco. Because of its high density, zircon provides excellent flow characteristics in a primary slurry. The round grains produce smooth casting surfaces, reducing rough casting defects.

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Tabular Alumina

Tabular Alumina
Tabular alumina is high-density, fully shrunk, coarse crystalline alpha aluminas that have been converted to the corundum form. It offers a wide range of granular or powdered particle size distributions. Typical chemical and physical properties include chemical purity, chemical inertness, high density, low water absorption, extreme hardness, high thermal conductivity, good resistance to thermal and mechanical shock, high heat capacity, high electrical resistivity and excellent abrasion resistance.

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