Fiberfrax® Variform Castable Insulation
Durable Ceramic Fibre Material Rated to 1200°C 

Fiberfrax® Variform is a castable insulation material composed of ceramic fibres and inorganic hydraulic binders. Supplied in convenient 20 kg bags, it is designed for high-temperature industrial applications and offers exceptional thermal stability, corrosion resistance, and low heat storage. This material is ideal for forming thick insulation linings in furnaces, kilns, and boiler interiors, and is easy to mix and install, drying to a durable, low-conductivity structure.

Key Features:

• Temperature Rating: Continuous use up to 1200°C
• Melting Point: 1760°C for long-term thermal protection
• Thermal Efficiency: Low thermal conductivity and reduced heat retention
• Durability: Withstands thermal shock and corrosion (not suitable for use with HF, H₃PO₄, or strong alkalis)
• Easy Application: Installs with minimal voids and excellent adhesion
• Packaging: Supplied in 20 kg bags for convenient handling

Typical Applications:

• Lining and repairing furnace walls
• Boiler interiors and burner insulation
• Heat treatment equipment and ladle linings
• High-temperature process and casting repairs

For added surface protection, Variform can be used in combination with our Fiberfrax QF180 refractory coating, which provides a hard, erosion-resistant finish over cast insulation.

Choose Fiberfrax® Variform when you need a reliable, castable high-temperature insulation solution with easy installation, convenient 20 kg bag supply, and outstanding performance under thermal stress.

Request A Quote - Fiberfrax Variform