Method of operation of a refractory fiber production process

In a process for the centrifugal spinning of refractory fibers from a molten stream of predominantely aluminosilicate refractory mixed oxide materials wherein the stream impinges on the circumferential surface of at least one rotating rotor of a plurality of rotating rotors of conventional diameter;

• the molten mixed oxide material initially adheres to the surface;
• thereafter portions of the adhered material are flung from the surface by the centrifugal force created by the rotation of said rotor;
• and each of said portions is thereby attenuated into a fiber or impinges on the circumferential surface of at least one other rotating rotor of said plurality of rotors from which it is subsequently flung by centrifugal force and ultimately thereby attenuated into a fiber, the improvement which comprises rotating all of the rotors at a circumferential speed of at least about 21,000 linear feet per minute.