Wax pressing (wax model made by shooting wax) --- wax repairing-wax inspection-group tree (wax module tree) --- shell making (first dip the slurry, drench the sand, then dip the slurry, and finally mold
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OBT Mining as the China No.1 biggest manufacturer for mullite sand which has been supplying to Germany Thyssenkrupp,totally capacity 200000tons and OBT casting subsidiary factory specializing in R&D and manufacturing of precision casting equipment, precision metal products processing and precision casting process. Comprehensive company for technical research and supply for the invesment casting sand and machines. ...