insulating Felts

insulating Felts

Our high temperature insulating Felts are resistant to high temperatures and thermal shock and offer a reliable and effective alternative to products made from fibreglass, textile, or metal. 

All our thermal Felts are made using high temperature insulating fibres bonded with an organic binder which begins to burn out at 180°C. The range comprises two fibre grades:

  • Alkaline Earth Silicate Fibre (AES) bulk made from our unique low bio-persistence fibre Superwool®
  • Refractory Ceramic Fibre (RCF) also known as Alumino Silicate Wool (ASW) bulk fibre made from Cerafelt®, Cerachrome®, and K-Shield™ 

AES (Superwool)

Superwool Felt is strong and lightweight, so it is easy to cut using a saw, water jet or stamp. It is resistant to wetting and chemical attack and is the only low bio-persistence fibre available with a classification temperature of 1300°C.

 Superwool fibres are exonerated and are not classified as carcinogenic by IARC or under any national regulations on a global basis. They have no requirements for warning labels under GHS (Globally Harmonised System for the classification and labelling of chemicals). In Europe, Superwool fibres meet the requirements specified under NOTA Q of European Directive 67/548. All Superwool fibre products are therefore exempt from the classification and labelling regulation in Europe.


Our Cerafelt and Cerachrome ceramic felts are strong, lightweight, flexible and easy to handle. They cut cleanly, making them ideal for the manufacture of the most intricate die-cut shapes and gaskets, even in thin sections. Cerafelt is rated to 1260°C, while Cerachrome is rated to 1427°C. 

K-Shield is a premium low-shot material with low thermal conductivity. It is very clean and has been developed for demanding markets such as aerospace. 

They are used in a wide range in thermal and acoustic insulation applications including:

  • High temperature gaskets and seals
  • Expansion joints
  • Molten metal resistant insulation

Contact us to discuss the particular requirements of your application. We have considerable applications expertise and can help with all types of thermal insulation product specification and problem solving.