CMC Bugatti

What is Diecast


Diecast models are made by pouring molten me




al under very high pressure into a mould cavity. It works kind of like an injection mould, in that the cavi


ty is made using two strengthened pieces of steel that have been worked into a certain shape by machine.

Most diecast models are made from metal that doesn’t contain much more than trace amounts of iron – such as lead, aluminium and zinc. Because there’s not much iron to be found in these, the finished diecast model is very light and corrosion-re


sistant (it wouldn’t be great if your beloved 1:18 Bugatti Type 57 SC Atlantic rusted the way that iron does).

There are some variations in diecast, such as pore-free discasting, which removes any air bubbles or defects that could occur during the casting, or, like injection moulds the metal can be injected into the cast cavity. This would reduce scrap metal.

There are four steps involved in making a diecast model –

  1. Die preparation The die, or mould, is prepared by spraying it with some kind of lubricant, under the same principals as greasing a baking tray.
  2. Filling The metal is then poured or injected into the mould at really high heat and high pressure. It’s left to solidify.


  3. Ejection Each diecast is fit with ejector pins, which make it easy to remove the model from the mould without damaging it.
  4. Shakeout This involves just removing any scrap parts such as sprues or runners, so that the product is nice and clean. I generally think about this bit as removing any knobby parts from a snapkit model when you take it out of the plastic frame.

After the shakeout, the product is inspected for any defects such as air bubbles and if it passes the test, it’s good to go to be painted or packaged.