Fondu_fyre
Fondu fyre
Heat and erosion resistant concrete used in aerospace applications
Fondu Fyre, sometimes called Fondue Fyre, is a refractory concrete developed for specialist application. Fondu Fyre is a heat and erosion resistant concrete developed during the Apollo space program. It was developed to withstand the supersonic plume of a rocket engine during launch and hot-fire tests [citation needed].
Allied Mineral Products based in Ohio holds the registered trademark on the name Fondu Fyre.[1]