1970s are widely used in metallurgy, machinery, building materials, petroleum, chemical industry. The natural rock, ore and other raw materials, or other pools in the cupola melting kiln (temperature 2000 ℃ less), with 50 atmospheres of pressure strong blow, quenched into fibrous. Or thrown silk, the melt flow off in a multi-stage rotary rotor, thrown by centrifugal force into the fiber, usually 3 to 9 microns in diameter, bulk density of 50 to 200 kg / m ^ 3, room temperature thermal conductivity 0.029 ~ 0.046 W / m · open below 600 ℃ 0.111 ~ 0.145 W / m · open, non-flammable, no mildew, no termite. By using the temperature of ordinary wool (less than 900 ℃); temperature rockwool (greater than 900 ℃). Quality wool 1250 ~ 1400 ℃ high temperature capability.