Investment Casting    1)  Processes:  Silica sol, Complex Shell Process, Water glass.   2)  Materials:  any grade of stainless steel, Carbon Steel, Alloy steel, iron alloy nickel bases                     and chrome bases, copper,brass and aluminum or according the customerâ??s request   3)  Weight:      Silica sol: 0.05kgs- 15kgs;      water glass:300kgs.       4) The precision of dimension: CT5-CT7