Investment casting involves pouring molten metal into wax patterns coated with ceramic slurry. The first part of this process is to make moulds into which wax gets injected to make wax patterns. The important part of investment casting is that the wax patterns are single use. During the process of making these parts, the pattern melts away and gets destroyed.

Investment casting or lost wax casting provides certain advantages over sand casting. Investment casting is more expensive than sand casting. But, the process provides thinner sections. It has better dimensional tolerance and finish. This method is better for casting complex, intricate and fine metal objects. It has a lot of adoption in the jewellery industry.

Tooling costs can be high for investment casting. A mould with fine details is used for injecting wax. This generates the wax patterns which are then coated with slurry. When baked at high temperatures, the slurry hardens and the wax melts. This creates a pattern for pouring metal.

The mould for making wax patterns is expensive, has long lead times and needs process control.