Another area of the HTL's work is the development of ceramic fibres for insulating elements, among other things. Fraunhofer-Center HTL is able to map the entire process chain for the production of ceramic fibres. This includes the synthesis and preparation of spinning masses, spinning, thermal preparation of the fibres and the application of various fibre coatings. The diameters of the individual fibres can be specifically controlled via the process parameters. This makes it possible to produce ceramic fibres with a diameter significantly outside the respirable range defined by the WHO. Furthermore, a manufacturing process that is as environmentally friendly as possible is established for the oxidic ceramic fibres, which offers advantages with regard to the industrial emission guidelines of the EU. Using various spinning processes, short fibres, long fibres or continuous fibres can be produced at the HTL from different material systems, such as aluminium oxide, mullite or silicon carbide, which can be polycrystalline or amorphous, dense or porous or even hollow. These fibres are used, among other things, as reinforcing fibres for load-bearing refractory elements or as material for insulating elements, such as vacuum formed parts.