Evonik, producers of specialty fibres, has developed new polyimide fibres said to have improved mechanical stability and flexibility at continuously high operating temperatures. Named P84 HT, the fibres have multilobal cross-section and a distinctly large surface area, allowing for better filtration efficiency. 

The fibres, produced at chemical production sites in Lenzing and Schörfling am Attersee, Austria, can be used in applications ranging from filter media for high-temperature filtration, through protective clothing and sealing materials for space vehicles, to various high-temperature applications such as thermal insulation.

In hot gas filtration applications, according to the company, the filter media were found to retain higher permeability over their entire life cycle. Depending on the field of application, this could reduce emissions of fine dust and waste gases. 

Image credit: Evonik