COATINGS AND HARDENERS
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COATINGS AND HARDENERS ALUMINA COAT, AL-HARD, SI-HARD ZIRCAR Refractory Composites, Inc. produces a comprehensive range of advanced high performance ceramic-ceramic composites and related products. Our materials are used around the world in demanding thermal, structural and electrical insulating applications at temperatures from 600°C(1112°F) to 1650°C(3002°F). For over twenty-five years we have been a problem solver working with many industries to resolve their thermal management problems. We have developed materials that have become industry standards for induction melting, forging and heat-treating applications, investment casting, glass processing, hot pressing, as well as many high temperature electrical applications. ZIRCAR ALUMINA COAT is an all-alumina liquid formulation used for hardening and increasing the refractoriness of the surfaces of alumina and aluminosilicate fiber products. ZIRCAR ALUMINA COAT is composed of high purity aluminum oxide in a water base. Hardening of the surfaces of blanket and felt insulation improves the resistance to erosion by high velocity gases and reduces the permeability of gases. The tendency of flame burn-through of low density ceramic fiber insulation in many cases can be prevented by a coating of ZIRCAR ALUMINA COAT . Ceramic papers, including alumina and alumina-silica paper can be rigidized with the liquid. Strong laminated tubes or complex shapes can be built up from saturated paper. Treated materials are ready for use as soon as they become dry. These treated materials are ideal for glass slumping and fusing molds and forms due to their non-sticking properties. The liquid is easily applied by brushing, rolling, dipping, sponging or spraying. It may be diluted with water if desired. ALUMINA COAT is non-flammable and is not affected by freezing. When applying with spray equipment, adequate ventilation and precautions against inhalation of particles should be observed. After the water has been removed by normal evaporation or by heating, a bond forms that stiffens the fibrous material. Coverage will depend on the degree of hardening desired. One gallon covers 100 ft2 if sprayed as a thin coating about 1/16" thick. SUGGESTED APPLICATIONS • • • ALUMINA COAT is used as a surface hardening and strengthening agent for low density alumina and alumina-silica ceramic fiber paper, blanket and board insulation. ALUMINA COAT is used as a bonding agent in the manufacture of “All-Alumina” high temperature composites and laminates. ALUMINA COAT is used to stop flame and hot high velocity gas erosion of furnace linings. ZIRCAR Refractory Composites, Inc. P.O. BOX 489, FLORIDA, NY 10921-0489 Tele: (845) 651-2200, Fax: (845) 651-1515 e-mail: sales@zrci.com Home page: http://www.zrci.com Technical Data Bulletin No. ZRCI-500 July 2005 This information, which is subject to change, is offered solely for your consideration and should not be taken as a warranty or representation for which we assume legal responsibility. It is not to be understood as permission or recommendation to practice a patented invention without a license and the user should determine whether relevant patents exist.

COATINGS AND HARDENERS ALUMINA COAT, AL-HARD, SI-HARD ZIRCAR AL-HARD Rigidizer/Hardener is used to increase the hardness of ZIRCAR Refractory Sheet products. AL-HARD is comprised of Aluminum Oxide and Phosphoric Acid in a water base. Refractory Sheet products treated with AL-HARD are ready for use after drying. It forms a chemical bond that hardens the fibrous material to an almost rock-hard consistancy. The degree of hardening depends on the amount of AL-HARD used and the strength of the starting material. AL-HARD is non-flammable and is not affected by freezing. It can be applied by...

COATINGS AND HARDENERS ALUMINA COAT, AL-HARD, SI-HARD ZIRCAR SI-HARD Rigidizer Hardener is an alkaline, aqueous dispersion of colloidal silica at 50% concentration. The dispersed silica is present as amorphous spheres, approximately 100 nanometers in size. The silica present is nonagglomerated and is completely dispersed. There is no mixing or dilution required. The particles carry a slightly negative charge and have a large surface-to-weight ratio. It is used for rigidizing and hardening the surfaces of ZIRCAR ceramic textile, papers and blankets. It also is ideal as a coating agent and...

COATINGS AND HARDENERS TYPES ALUMINA COAT, AL-HARD, SI-HARD APPLICATION INSTRUCTIONS (On Refractory Sheet Type RS-A Moldable) ZRCI AL-HARD Rigidizer/Hardener can be applied to A Moldable at a rate of up to 1 gallon/ 24in. x 72 in. roll. It can be applied at a lesser rate depending on the degree of hardening desired. Before applying, dry A Moldable at 100°C. Apply AL-HARD by immersing, spraying, brushing or sponging it on the surface of the dried product. Allow AL-HARD treated A Moldable to dry. ZRCI's ALUMIA COAT and SI-HARD can be applied by spray, brush or by dipping. The amount of...