Superwool Bulk Fibre

Low Biopersistent Bulk Fibre for High-Temperature Insulation and Thermal Processing Applications

Low Biopersistent Fibre Technology for High-Temperature Thermal Insulation

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.

Why Choose Superwool Bulk Fibre

Superwool Bulk Fibre combines lightweight insulation performance with excellent thermal stability and resilience, providing a versatile solution for thermal management, sealing and manufacturing applications.

Excellent thermal stability at elevated temperatures
Outstanding resistance to thermal shock
Low thermal conductivity for improved energy efficiency
Low heat storage characteristics
High-purity fibre composition with excellent corrosion resistance
Highly resilient fibre structure
Binder-free composition with no fumes or odours during first firing
Available in multiple grades to suit a range of operating temperatures

Superwool Bulk Fibre Technical Data

Property	Superwool Plus	Superwool Prime
Classification Temperature	1200°C	1300°C
Melting Temperature	1325°C	1438°C
Mean Fibre Diameter	2.5-3.4 microns	2.6-3.9 microns
Material Type	Low Biopersistent AES Fibre	Low Biopersistent AES Fibre
Fibre Form	Bulk Chopped	Bulk Chopped
Colour	White	White
Chemical Analysis (%)
SiO₂	62-68	64-70
CaO	26-32	29-35
MgO	3-7	-
Other	<1	<3

Typical Applications

Superwool Bulk Fibre is used in a variety of industrial applications requiring lightweight thermal insulation, sealing performance and resistance to thermal cycling.

Expansion joints
Low mass kiln cars
Tube seal fabrication
Thermal insulation systems
Acoustic insulation applications
Filtration media
Reinforcement and filler for plastics, resins and paints
Fillers for mastics and cements
Raw material for vacuum formed boards, papers, felts and custom shapes

Typical Industries

Superwool Bulk Fibre is used across industries where lightweight, high-temperature insulation materials are required to improve thermal efficiency, manage heat and support demanding manufacturing processes.

Industrial furnaces
Heat treatment
Ceramics manufacturing
Refractory production
Process engineering
Power generation
Petrochemical processing
Industrial insulation manufacturing
Advanced materials production

Technical Support and Specification Guidance

Selecting the correct bulk fibre insulation material is essential to achieving long-term thermal performance, energy efficiency and operational reliability. Factors such as operating temperature, process conditions and installation requirements should all be considered during material selection.

Our technical team provides support across insulation specification, performance optimisation and application design, ensuring the most suitable bulk fibre solution is selected for your operating environment and performance requirements.

Need help specifying the right material?

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.

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