A new non-classified, pollution resistant high temperature insulation fibre

Reference Presenter Authors
14-006 Farid Modarresifar Wynn, A.(Morgan Advanced Materials - Thermal Products Division); Jubb, G.(Morgan Advanced Materials - Thermal Products Division); Modarresifar, F.(Morgan Advanced Materials - Thermal Products Division); For many years RCF (Refractory Ceramic Fibre) has been the preferred insulation material used in high temperature applications in Iron and Steel, Chemical Processing and Ceramics Industries where there is no direct contact with liquids or high velocity burner impingement. This is due to its low thermal conductivity, low thermal mass, low density and ease of installation, repair and removal. After asbestos was classified as a human carcinogen, attention switched to all fibrous materials and because RCF had replaced asbestos in many applications, it was given high scrutiny. This resulted in RCF being classified as 1b under the Global Harmonized System and in Europe is the subject of strict Binding Occupational Exposure Limit Values. In the early 1990s Superwool® was introduced as the first low biopersistent fibre that demonstrated rapid removal from the lung. Other Alkaline Earth Silicate (AES) fibres followed and the initial use limit of 1000°C was gradually increased up to 1150ºC. However AES fibres have performance limitations in working environments with high pollutants, especially alkalis, limiting their use in Iron and Steel and Ceramics applications. Their use in Chemical Processing is also limited due to their classification temperatures being <1300ºC. To address these limitations, Morgan’s Thermal Ceramics Product Division, has developed a new low biopersistent fibre called Superwool® XT. This has successfully undergone extensive long term application trials. It was developed to produce a unique chemistry that has low biopersistence, a classification temperature of 1450ºC and good pollution resistance. Superwool® XT also has high thermal expansion characteristics which counteract the shrinkage seen in service. Furthermore it does not form crystalline silica. Modules have been working at 1250-1300ºC in continuous and cycling applications in both Iron and Steel and Chemical Processing furnaces for >2 years.
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