Cera Mastic

Cera Mastic provides a ready-to-use, water-based ceramic putty patching material that can be filled into any fissure, crack or defect in refractory materials. This unique repair product is based on a proprietary mixed oxide system that is completely free of Refractory Ceramic Fiber (RCF). Cera Mastic is engineered to fill damaged areas with no sintering, shrinking or cracking with use. Adheres well to all refractory surfaces, dense or porous, and can be used as glue to join ceramic materials. Applicable for all environments from 300 C (572 F) to 1500 C (2732 F). Ready-to-use after applying with putty knife or trowel followed by drying. No special cure is needed.  NOTE: This product does not contain Boron Nitride.

This product does not contain Boron Nitride.


Key Attributes

  • Very wide use temperature range, up to 1500 C
  • Stable with many molten metals and glasses
  • Smoothly applies and spreads easily
  • Fills the damaged areas and does not sinter, shrink or crack with thermal cycling
  • High adhesion to all refractory types (dense or porous) without chipping or flaking
  • Can be used to join ceramic materials by curing as low as 300 C
  • Excellent strength, hardness, and toughness
  • Even adheres to metal surfaces at temperatures <500 C
  • Does not contain RCF (Refractory Ceramic Fiber)
  • Long life of the repaired areas due to inertness and non-reaction with molten materials
  • Not sensitive to freezing
  • May be overcoated with BN Cera Patch or BN Lubricoat paint to provide excellent non-wetting to molten aluminum

Ideal Uses

  • Repairing and patching cracks, fissures, ruts, pock marks, joints, defects in molten-aluminum transport refractories
  • Preventing adhesion and sticking of residual metal in cavities and cracks
  • Gluing/joining ceramic materials