FIELD: manufacture of high-temperature filters. SUBSTANCE: method involves heating basalt rocks to 1500-1600 C and pulling fibers at the rate of 3500-4500 m/min from the melt with a viscosity of 110-500 Pa/s. Fiber diameter is 4.0-3.5 microns. EFFECT: higher efficiency. 1 tbl
Authors
Dates
1994-08-30—Published
1992-03-12—Filed