Present status and existing shortcomings of raw-auxiliary materials for investment casting were reviewed

and countermeasures were presented.Carbon slag resulted from baked pattern can result in inclusion and reactive gas hole in the investment castings.These defects can be eliminated through multi-pile filtration and centrifugal separation.Properties of different shell mold materials and its problems as well as improving measures were surveyed.Application of bonding agent and alloy materials was introduced briefly

and developing tendency was proposed.