Hardun KKQ Perlite Expansion and Vitrified Furnace was invented and developed by our factory director and senior engineer Kong Keqiang (KKQ) in February 2003. In 2005 he obtained the national patent for the furnace. This is the world's first production equipment dedicated to industrial production to produce closed-cell vitrified expanded perlite microbeads. Unlike the open perlite products produced by traditional perlite expansion furnaces, the perlite produced through our perlite expansion furnace production line is in the form of closed-pore vitrified microbeads, which greatly enhances and expands the use function and scope of perlite. It is a historic breakthrough in green new materials, greatly improving the new industrial value of perlite, especially in the application of exterior wall insulation materials, creating huge wealth for countless customers and making great contributions to the social green environmental protection, energy conservation and sustainable development. It is a great invention of new environmentally friendly materials this century.