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The UK leader in Stud Welding and Refractory products
Insulfrax Bulk Fibre is a high-performance alkaline earth silicate (AES) fibre designed for thermal insulation applications requiring low thermal conductivity, lightweight performance and reliable temperature stability. Suitable for use at temperatures up to 1200°C, it provides an effective insulation solution across a wide range of industrial processes and thermal management systems.
Manufactured from advanced alkaline earth silicate fibres, Insulfrax Bulk Fibre delivers excellent thermal efficiency, good acoustic absorption and outstanding wet forming characteristics. Its flexible structure allows it to be easily adapted to irregular geometries, making it ideal for filling voids, packing expansion joints and supporting fibre-based manufacturing processes.
As the foundation of the Insulfrax product family, Insulfrax Bulk Fibre offers a versatile solution for applications requiring lightweight, adaptable insulation materials capable of performing in demanding thermal environments.
Insulfrax Bulk Fibre combines excellent thermal performance with lightweight handling characteristics, providing a versatile insulation solution for high-temperature industrial applications and manufacturing processes.
| Property | Insulfrax |
| Classification Temperature | 1200°C |
| Melting Temperature | >1330°C |
| Mean Fibre Diameter | 3.2 Microns |
| Material Type | Alkaline Earth Silicate (AES) Fibre |
| Fibre Form | Bulk & Chopped Fibre |
| Colour | White |
| Typical Chemical Analysis (fibre wt. %) | |
| SiO2 | 61.0-67.0 |
| CaO | 27.0-33.0 |
| MgO | 2.5-6.5 |
| Al2O3 | <1.0 |
| Fe2O3 | <0.6 |
Insulfrax Bulk Fibre is used in a variety of thermal insulation and manufacturing applications where lightweight, flexible fibre materials provide effective thermal management and process efficiency.
Insulfrax Bulk Fibre is used across industries requiring lightweight, adaptable insulation materials for thermal management, expansion accommodation and high-temperature manufacturing processes.
Selecting the correct bulk fibre material is essential to achieving the required thermal performance, manufacturing efficiency and long-term reliability. Factors such as operating temperature, installation requirements and production methods should all be considered during specification.
Our technical team provides support across material selection, 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, manufacturing or thermal management requirements. We can assist with material selection, product suitability and application-specific performance guidance.
