Refractory Coating - R28
R28 Refractory Coating is a mixture of alumina and silica that is used for
treating surfaces of ceramic fiber products to form a protective surface to
improve the resistance to chemical attack, mechanical wear, high gas


  • Increase surface hardness of ceramic fiber blanket and board
  • Increase resistance to erosion of high velocity gas
  • Bond composites and laminates
  • Easily applied by brushing, dipping, rolling or spraying method.
  • Thermal shock resistant
  • Reflect heat
  • Upper using temperature 2800°F


  1. Surfaces to be coated should be free of any grease and oil. Surfaces
    with high water absorption should be wetted with water before using
    the coating
  2. Mix coating well because material may settle while transported or
  3. Coating can be applied by brushing, rolling, and spraying (by add
    water to a suitable viscosity). Respiratory protection and ventilation
    are required when applied by spraying.
  4. Coating receives its hardening action by air-drying for about 24 hours
    from the removal of physical water. The curing process can be
    accelerated by heating. Curing is a function of the coating thickness,
    size, and geometry, as well as humidity. However, the coating dried at
    room temperature is not water-proof. Final curing should be done at
    high temperature (>1000 °F).
  5. One pound of coating can cover an area of approximately 5-30
    square feet, depending on how to use it.
  6. After curing, R28 coating will render a hard surface without
    completely hardening the interior of the ceramic fiber body.
A28 High Temperature Coating
Tucson, Arizona, USA
Skyline Components, LLC