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The UK leader in Stud Welding and Refractory products
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The UK leader in Stud Welding and Refractory products
Fiberfrax Bulk Fibre is a high-purity alumina-silicate ceramic fibre designed for thermal insulation applications where flexibility, low thermal conductivity and reliable high-temperature performance are essential. Suitable for continuous use at temperatures up to 1400°C, it provides effective thermal management across a wide range of industrial processes and equipment.
Manufactured from high-purity ceramic fibres, Fiberfrax Bulk Fibre offers excellent thermal stability, low heat storage and outstanding resistance to thermal shock. Its lightweight, adaptable structure makes it ideal for filling, packing and insulating irregular geometries where rigid insulation materials are impractical.
Resistant to oxidation, reduction and most corrosive atmospheres, Fiberfrax Bulk Fibre delivers dependable insulation performance in demanding operating environments. If exposed to moisture, its thermal and physical properties are fully restored once dried.
Fiberfrax Bulk Fibre is a versatile high-temperature insulation material designed for applications requiring lightweight thermal insulation, expansion accommodation and reliable sealing performance. Its unique fibre structure provides excellent thermal efficiency while maintaining stability in demanding industrial environments.
| Property | Fiberfrax Bulk | Fiberfrax H Bulk | Fiberfrax Z Bulk |
| Classification Temperature | 1260°C | 1350°C | 1400°C |
| Melting Temperature | Application Dependant | Application Dependant | Application Dependant |
| Fibre Diameter | 2.1 Microns | 2.1 Microns | 3.25 Microns |
| Fibre Form | Bulk & Chopped Fibre | Bulk & Chopped Fibre | Bulk & Chopped Fibre |
| Material Type | Alumina-Silicate Ceramic Fibre | Alumina-Silicate Ceramic Fibre | Alumina-Silica-Zirconia Ceramic Fibre |
| Colour | White | White | White |
| Typical Chemical Analysis (wt.%) | |||
| SiO2 | 50.0-58.0 | 46.0-50.0 | 52.0-56.0 |
| Al2O3 | 42.0-50.0 | 50.0-54.0 | 28.0-32.0 |
| ZrO2 | - | - | 14.0-18.0 |
| Fe2O3 + TiO2 | <0.2 | <0.2 | <0.2 |
| Alkalis | <0.25 | <0.25 | <0.25 |
Fiberfrax Bulk Fibre is used across a wide range of industrial applications where flexible insulation, thermal sealing and expansion accommodation are required to maintain process efficiency and equipment reliability.
Fiberfrax Bulk Fibre is used across a wide range of industries where reliable high-temperature insulation, sealing and thermal management are critical to operational performance and equipment protection.
Selecting the correct bulk fibre insulation material is essential to achieving thermal efficiency, operational reliability and long-term performance. Factors including temperature exposure, atmosphere, movement requirements and installation method should all be considered during specification.
Our technical team provides support across material selection, thermal performance optimisation and application design, ensuring the most suitable insulation solution is specified for your operating conditions and process requirements.
Speak with our technical specialists to discuss your insulation, sealing or thermal management requirements. We can assist with material selection, product suitability and application-specific performance guidance.
