1, lost wax casting is both ionic bond and covalent bond oxide, so lost wax casting is a complex homogeneous transformation of polycrystalline material;Appear in the nature of quartz is mostly low temperature type, mainly exist in quartz.2 agricultural machinery casting, lost wax casting, the surface should be colorless lit viscosity liquid, but because of containing impurities (more) of the product made by glauber's salt impurities, so the commercial sodium silicate is grey or micro red half lit or not lit viscous liquid.Its technological function important by M and pattern material density d to weigh.