Perlite Expansion & Vitrification Furnace is invented by our factory director and senior engineer Kong Keqiang in February 2003, in the same year, He obtained patent for this kind of furnace,and it is the first one in the world to be put into industrial production, there are 30 furnaces which have already running for 5 years continually ,they are used to produce closed pearlite vitrified microspheres and hollow perlite vitrified microspheres .We use 6 microcomputers to full automatically control technology processes of closed pearlite vitrified microspheres such as sand softening,crystal water vapourization insantaneously ,size of hollow balling ,shell vitrified for water-proof and shell hardening. In the past five years in China ,80 percent of perlite vitrified microspheres used for wall heat insulation mortar were produced by our factory’s Perlite Expansion & Vitrification Furnace.At present, many countries in the world such as America, Canada, Australasia, Poland,Thailand,Russia and south Korea have gradually adopted our funaces to produce new wall heat preservation materials------ perlite vitrified microspheres.