Silica Matrix Composite insulates hot press applications.

Press Release Summary:

Refractory Sheet Type RSLE-57 exhibits low coefficient of expansion 0.3 x 10-6°C, which provides resistance to thermal shock up to 1,200°C in oxidizing atmosphere and permits use with rapid variation in temperature in that zone. Beyond 1,200°C, it transforms into crystalline structure, while maintaining properties up to 1,650°C. Corrosion-resistant RSLE-57 is 100% organic free and contains no refractory ceramic fiber.

Original Press Release:

Zircar Introduces New Refractory Sheet Type RSLE-57

ZIRCAR Refractory Sheet Type RSLE-57 is a low expansion high strength reinforced silica matrix composite. This remarkable material was designed for use as a high strength insulator in induction hot press applications w.

RSLE-57's very low thermal expansion coefficient and high hot strength combine to give it thermal shock resistance not found in other structural ceramic matrix composite materials.

RSLE-57's exhibits a very low coefficient of expansion 0.3 x 10-6 °C which provides remarkable resistance to the thermal shock up to 1200°C (2192°F) in an oxidizing atmosphere and permits its use with rapid variation in temperature in that zone. Beyond 1200°C (2192°F) it transforms into a crystalline structure, while maintaining its properties up to 1650°C (3002°F) providing that there is no significant fall in temperature. At temperatures above this the material will exhibit surface glazing.

Other unique properties of RSLE-57 are:
o A low thermal conductivity.
o An excellent electrical insulation.
o A high chemical purity.
o An excellent resistance to corrosion (from molten metal and glass)

RSLE-57 also exhibits exceptional non-wetting properties when used in contact with molten aluminum making it useful in numerous molten aluminum contact applications.

RSLE-57 is 100% organic free and contains no refractory ceramic fiber. It is readily machined to precision tolerances with conventional tooling.

You can check out our web site ( for more information on this material as well as many other products we offer.

For more information please contact ZIRCAR Refractory Composites, Inc., P.O. Box 489 Florida, NY 10921 via telephone (845) 651-2200, fax (845) 651-1515 or e-mail at

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