High temperature, high silica/alumina content with Andalusite for excellent resistance to thermal shock, pressure and abrasion from high performance rocket propellants that other ceramic materials lack. It is capable of resisting direct combustion gas heat to 3000° F (white hot) and indirect heat to approx 3500° F. For making nozzles, moisten slightly with water (or sodium silicate) and press in a forming die using hydraulic pressure @ 5000 psi or greater followed by baking at 500° F to remove all traces of moisture. The more pressure used to form, the higher the abrasion resistance will be to pressures and heat. They can be lathe cut for "O" rings or recessed for snap rings, etc. Resists heat to approx 3000° F