COATINGS AND HARDENERS0 pages

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
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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.