Lost wax casting technology believe everyone is seen in the current industry also without our use of the process.1, lost wax casting bentonite is mainly composed of montmorillonite mineral.The expansion of the crystal structure and lattice characteristics of kaolinite is higher than that in montmorillonite wet strength, its strength is affected by particle size is smaller. 2, lost wax casting according to the characteristics of the above several aspects, bentonite main commonly used clay sand wet type adhesives. 3, natural montmorillonite as the main types and relative content of exchangeable cations, mainly sodium montmorillonite, calcium montmorillonite, magnesium lithium montmorillonite, montmorillonite, hydrogen montmorillonite, etc.That is commonly used in precision casting production have calcium base bentonite, sodium base bentonite and some mixed base bentonite.