The metal you use for your medical equipment will depend on the type of equipment you are making, but you will often find medical equipment die casting parts made of zinc or magnesium as well as aluminum.
Zinc castings are popular when your item is a patient-facing device that needs an attractive painted or plated finish, since zinc provides a very smooth surface to work on and can be plated easier than aluminum die castings. You can also easily make very thin-walled parts with zinc, which is critical when weight is an important factor in a specific application.
Zinc has a low melting point, which provides for longer mold life than aluminum die casting offers. Like aluminum, zinc has great corrosion resistance and high thermal conductivity. It’s quite durable, strong and hard and offers a great deal of dimensional stability.
Magnesium is a great choice for die casting when you need very light parts. Magnesium is extremely lightweight, with a high strength to weight ratio, low density, good corrosion resistance and good electrical and thermal conductivity. On the other hand, it’s more difficult to die cast due to its handling requirements, and it’s considered a “specialty” alloy in the die casting industry. There are not many die casters pouring magnesium alloys so supply constraints may be an issue if you have high volume parts.