Difference Between Molding and Casting

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Molding and casting are two of the most important manufacturing processes in the world. They’re used for a variety of purposes, from making plastic bottles to creating metal sculptures. Molding is often associated with plastics, while casting is usually reserved for metals. In this blog, we’ll discuss their differences, which can determine what each process is best suited for.

Both molding and casting involve the production of an object by taking a liquid material, pouring it into a mold, and then letting it harden.


Molding is the process of using heat or pressure to create shapes out of molten materials like metal or plastic.


Casting is the technique of pouring material around an object in a mold to create a duplicate, typically out of metal.

What is Injection Molding?

Injection molding is a manufacturing process that uses heated plastic to create items such as bottles and toys.

The injection molding steps include heating the material until it’s in its liquid form, injecting it into the mold, allowing for cooling time, packing out any excess material that will be removed later on during production, and ejecting the finished product.

Injection molding is an ideal option for creating a large number of items that are consistent in their shape and size because it uses a closed system to ensure consistency.

What is Extrusion Molding?

Extrusion molding is the process of forcing material through a die to create long objects with similar cross-sections.

It’s an excellent choice for creating tubes, hoses, and pipes because it can produce more than one tube at once by using multiple dies on the same shaft. The machinery needed for extrusion molding is more expensive than other molding methods.

What is Die Casting?

Die casting is one of the most popular metal-casting processes, especially when making thin-walled parts since the process is very quick. Die casting uses a die to create the mold, which then fills with molten metal that hardens during production.

The most common metals used for die casting are aluminum and zinc as well as some alloys of copper, magnesium, lead, tin, etc. Many automotive parts such as cylinder heads or gearbox cases are made from die castings.

What is Investment Casting?

Investment casting is a metal casting process that uses low melting point metals like tin, aluminum, or zinc to create intricate designs with precise detail and thin walls for customized products. The molds used in investment casting can be highly sophisticated since they involve very fine details while maintaining a sand-like consistency.

Investment casting is ideal for creating items such as jewelry, scientific lab equipment, and components that require a high level of precision, along with the ability to reuse molds over and over again.

Engineering design services in San Francisco

Other than these types and methods for both molding and casting, there are a lot more. If you want to find out the best technique for your new project, Connekt LLC is the place. We have the best FEA consulting services in Grass Valley. You can also rely on us for custom injection molding and engineering design services in Sacramento. Contact us today and get the best guideline.

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