Durafelt Felts

High-Temperature Refractory Felt for Sealing, Gaskets and Thermal Barrier Applications

Flexible, Resilient Insulation for Applications up to 1600°C

Fiberfrax® Durafelt™ is a high-performance refractory felt manufactured from Fiberfrax ceramic fibres and specially selected organic binders. Produced using an advanced felting process, Durafelt combines low thermal conductivity with excellent flexibility, resilience and handling strength, making it an ideal solution for high-temperature sealing and thermal management applications.

Designed to withstand demanding thermal environments, Durafelt provides reliable insulation performance while remaining lightweight, flexible and easy to fabricate. Its unique construction allows it to be wrapped, cut and shaped to suit a wide range of industrial applications where conventional insulation materials may be difficult to install or adapt.

Available in multiple grades with classification temperatures up to 1600°C, the Durafelt range offers versatile solutions for high-temperature sealing systems, expansion joints and thermal barrier applications.

Why Choose Durafelt Felts

Durafelt combines thermal insulation performance with exceptional flexibility and resilience, making it particularly suitable for sealing and fabricated insulation applications.

Classification temperatures up to 1600°C
Excellent flexibility and handling characteristics
High resilience for sealing and expansion applications
Low thermal conductivity
Lightweight construction
High-temperature stability
Easy to wrap, cut and shape
Available in multiple grades and densities
Reliable thermal performance in demanding environments
Suitable for fabricated insulation and sealing systems
Precise thickness control for engineered applications

Durafelt Technical Data

Property	Durafelt LD	Durafelt HD	Durafelt Z	Durafelt 160
Classification Temperature	1250°C	1250°C	1400°C	1600°C
Melting Temperature	1800°C	1800°C	1740°C	1760°C
Density Range	110–190 kg/m³	200–300 kg/m³	200–300 kg/m³	110–220 kg/m³
Melting Point	1800°C	1800°C	1740°C	1760°C
Typical Chemical Analysis (wt. %)
SiO₂	48.0-54.0	50.0-58.0	52.0-56.0	22.0-40.0
Al₂O₃	46.0-52.0	42.0-50.0	28.0-32.0	60.0-78.0
ZrO₂	-	-	14.0-18.0	-
Others	<0.25	<0.25	<0.25	Trace

Typical Applications

Durafelt is used in applications where flexible insulation materials are required to provide reliable thermal sealing, thermal barriers and protection in high-temperature operating environments.

High-temperature gaskets and seals
Expansion joints
Ingot mould liners
Molten metal transfer systems
Back-up insulation systems
Thermal barriers
Furnace sealing systems
Fabricated insulation components
Thermal management applications

Typical Industries

Durafelt is specified across industries where flexible high-temperature sealing, thermal protection and insulation systems are required to improve process reliability and thermal efficiency.

Metals processing
Aluminium production
Foundries
Heat treatment
Industrial furnaces
Refractory engineering
Power generation
Process engineering
General high-temperature manufacturing

Technical Support and Specification Guidance

Selecting the correct refractory felt is critical to achieving thermal performance, sealing effectiveness and long-term reliability. Factors such as operating temperature, mechanical requirements, sealing performance and installation conditions should all be considered during material selection.

Our technical team provides support across material selection, thermal performance optimisation and application design, ensuring the most suitable Durafelt grade is specified for your operating conditions and process requirements.

Need help specifying the right material?

Speak with our technical specialists to discuss your sealing, insulation or thermal management requirements. We can assist with material selection, grade selection and application-specific performance guidance.

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