Superwool Felts

High-Temperature Superwool Felt for Precision Fabricated Insulation Components

Available in Prime and XTRA Grades for Thermal Sealing, Fabrication and Extreme High-Temperature Applications

uperwool® Felt is a premium range of low biopersistent fibre insulation materials engineered for high-performance thermal management and precision fabrication. Manufactured using advanced fibre technology and hot-pressing processes, the range combines outstanding thermal insulation with excellent flexibility, strength and fabrication characteristics for demanding industrial applications.

From easily fabricated Prime Felt through to high-performance XTRA Unifelt, Superwool Felt provides reliable thermal insulation across a wide operating temperature range. Available in multiple densities and thicknesses, it is ideal for die-cut components, thermal seals, expansion joints and engineered insulation systems where long-term performance is essential.

Why Choose Superwool Felts

Superwool Felt combines exceptional thermal insulation performance with outstanding fabrication capabilities, offering engineered solutions from general industrial insulation through to demanding high-temperature applications.

Available in Prime and high-performance XTRA grades
Classification temperatures up to 1450°C
Excellent flexibility and handling strength
Low thermal conductivity
Easily die-cut, stamped, waterjet or machined
Excellent thermal stability and thermal shock resistance
Low heat storage for improved energy efficiency
Chemically stable with excellent resistance to pollutants
Does not form respirable crystalline silica (XTRA grade)
Available in a range of densities and thicknesses

Superwool Felt Technical Data

Property	Superwool Prime	Superwool XTRA
Classification Temperature	1300°C	1450°C
Melting Temperature	Dependant on Application	1650°C
Density Range	96-160 kg/m³	220 kg/m³
Typical Chemical Analysis (wt. %)
Al₂O₃	-	27-33
SiO₂	64-70	23-28
CaO	29-35	-
K₂O	-	5-9
ZrO₂	-	0.5-1.5
MgO	-	0.5-1.5
Other	<3	<0.5

Typical Applications

Isofrax Felt is widely used where lightweight thermal insulation materials are converted into fabricated components, thermal seals and high-temperature insulation products for demanding industrial environments.

High-temperature gaskets
High-temperature sealing systems
Furnace, kiln and boiler expansion joints
Die-cut insulation components
Thermal barrier systems
Thermal break components
Ingot insulation
Back-up insulation
Veneering modules
Custom fabricated insulation parts

Typical Industries

Superwool Felt is specified across industries requiring lightweight, precision-fabricated thermal insulation components and advanced thermal management solutions operating in demanding environments.

Industrial furnaces
Steel manufacturing
Heat treatment
Appliance manufacturing
Foundries
Process engineering
Power generation
Industrial insulation fabrication
Refractory engineering
Thermal management systems

Technical Support and Specification Guidance

Selecting the correct Superwool Felt grade is essential for achieving optimum thermal performance, fabrication accuracy and long-term reliability. Operating temperature, fabrication methods, component geometry and installation conditions should all be considered when choosing between Prime and XTRA grades.

Our technical team provides support with material selection, component design and fabrication requirements, ensuring the most suitable Superwool Felt solution is specified for your application.

Need help specifying the right material?

Speak with our technical specialists to discuss your thermal insulation, sealing or fabricated component requirements. We can help you select the appropriate Superwool Felt grade, density and thickness to deliver optimum performance for your application.

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