... dry sand(no water,bond,tagger),then it is hot up,molding,pressurized sand-box,take out the air,so the ... .Vacuum airproof mloding is made up of:pattern plate, vacuumsysterm, calefaction, molding and server, vibrating table,sandmolding machine and so on.Vacum ... airproof molding have the excellence of high automatic,high quality of casting,high precision,cleanse ...