ArianeGroup Bremen has started the development of Flexible External Insulation (FEI) already within the HERMES program in the eighties. In the meantime a complete FEI product family was developed and qualified which covers a temperature range from 300°C to 1100°C. The FEI with its excellent performance w.r.t. reusability, low mass, simple inspection and maintenance, is the favorable TPS for the leeward-side of any space transportation system.
Now the Flexible External Insulation is integrated on ORION service module rear side.