The gravity die casting rely on gravity to fill the mould while pressure die casting allows alloy to be injected quickly. Pressure die casting is far more automated and thus have very high productivity and reduced human error.

Tooling cost for gravity die casting is much lower than pressure die casting due to the use of cast iron instead of hardened steel for the mould, plus that the pressure die casting require sophisticated internal cooling channel design.

The advantage of gravity die casting is that the part in as-cast state is stronger than pressure die casting (without subsequent heat treatment), thanks to the slower speed the molten metal enters the mould, which reduced air trapped inside. The choice of which process to be used thus depend on the estimated total quantity and economic factors. We can help you decide which casting solution is best for your project.

You have the complete ownership of the mould. The mould by default is stored permanently without any expiry date. If there’s any need to transfer the tool to a UK foundry it’s easy to do so. It is also common for the mould to be made first than shipped to a UK foundry for subsequent casting (see tool making service)

Tool wear and damage can occur, resulting in sub-standard parts (more burrs, breaking edges, uneven surfaces etc.). Although in most cases mould can be repaired to extend its lifespan, other factors need to be considered whether making a new tool is more economical.