Insulfrax Papers

Low Biopersistent Insulation Paper for Thermal Management and High-Temperature Sealing

Lightweight, Flexible Thermal Insulation for Applications up to 1200°C

Insulfrax® Paper is a high-performance insulation paper manufactured from advanced calcium magnesium silicate (CMS) fibres formed into a lightweight, flexible nonwoven matrix. Designed to provide reliable thermal insulation, sealing performance and ease of fabrication, Insulfrax Paper offers an effective solution for applications requiring thermal management in demanding industrial environments.

Manufactured using specialised papermaking technology, the fibres are randomly orientated and bonded to create a uniform material that combines low thermal conductivity with excellent flexibility and handling characteristics. Its lightweight structure allows it to be easily wrapped, shaped, cut and fabricated into a wide range of insulation and sealing components.

The advanced calcium magnesium silicate chemistry used in Insulfrax Paper provides excellent thermal stability and superior resistance to molten aluminium wetting when compared with traditional alumina-silica ceramic fibre products, making it particularly well suited to non-ferrous metal processing applications.

Why Choose Insulfrax Paper

Insulfrax Paper combines thermal insulation performance with excellent flexibility and fabrication characteristics, providing a versatile solution for high-temperature sealing and thermal management applications.

High-temperature stability up to 1200°C
Low thermal conductivity
Lightweight and flexible construction
Easy to wrap, cut and shape
Superior resistance to molten aluminium wetting
Excellent fabrication characteristics
Reliable thermal insulation performance
Suitable for sealing and gasket applications
Manufactured from advanced CMS fibre technology
Meets European regulatory requirements

Insulfrax Technical Data

Property	Value
Classification Temperature	1200°C
Melting Point	>1330°C
Density	150 kg/m³
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

Typical Applications

Insulfrax Paper is used in applications where lightweight insulation materials are required to provide thermal protection, sealing performance and heat management in high-temperature operating environments.

Automotive heat shields
Aerospace heat shields
Gaskets for ovens, stoves and heaters
Appliance insulation systems
Non-ferrous ingot mould liners
Refractory back-up insulation
Ladle insulation systems
Glass tank insulation
Brazing and soldering parting media
Molten aluminium transfer systems

Typical Industries

Insulfrax Paper is specified across industries where lightweight thermal insulation, sealing solutions and high-temperature process protection are critical to operational performance and reliability.

Aerospace
Automotive manufacturing
Appliance manufacturing
Aluminium processing
Non-ferrous metals production
Glass manufacturing
Heat treatment
Industrial furnaces
Process engineering
Thermal insulation fabrication

Technical Support and Specification Guidance

Selecting the correct insulation paper is critical to achieving thermal efficiency, sealing performance and long-term reliability. Factors such as operating temperature, fabrication requirements, chemical exposure and application design should all be considered during material selection.

Our technical team provides support across product selection, thermal performance optimisation and application design, ensuring the most suitable insulation solution is specified for your operating conditions and process 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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