IMS Mastics are insulation materials composed of IMS Body Soluable Wool dispersed in high temperature binders, which upon drying produce a strong insulating structure with low thermal conductivity. These versatile products can be caulked, trowelled, pumped or moulded quickly and easily into place for use in filling, sealing, repair and general packing applications.

General Characteristics

  • Low Thermal conductivity
  • Resistance to thermal shock
  • Low shrinkage
  • Good adhesion
  • Ease of installation

Typical Applications

  • Caulking of refractory cracks and expansion joints
  • Casing “hot spot” repairs ( refractory or fibre lined equipment)
  • Moulding of small components
  • Gap filling in fibre module linings


Physical Properties

Colour: White

Product Form: Putty

Use Limit (°C):  1200

Wet Density (kg/m3): 1090

Dry Density (kg/m3): 270


Thermal Conductivity ( W/mK)

Mean Temperature

600°C : 0.09

800°C: 0.13

1000°C: 0.19



 Our Mastic can be easily installed using a trowel or spatula and can be dried at room temperature- but this requires an extended period of time. Firing or heat up of the equipment or furnace will allow for quicker removal of moisture from the material. During the first firing, some initial out-gassing can be expected at elevated temperatures. Ventilation is required to permit escape of steam.