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Aluminum vs. Cast Iron: What’s the Difference

Aluminium vs. Cast Iron

When choosing a material for a project, there are many factors to consider. From cost and strength to conductivity and density, each type of material has unique properties that should be considered. In this blog post, we’ll look at two popular materials—aluminium and cast iron—and compare their various properties side-by-side. So let’s dive in!

Aluminum vs. Cast Iron Density

When it comes to density, aluminium is much lighter than cast iron. Aluminium has a density of 2.7 g/cm3, while cast iron has a much higher density at 7.8 g/cm3. This means that when it comes to weight, aluminium is much easier to work with as it takes up less space and is also more lightweight than cast iron.

Aluminum vs. Cast Iron Conductivity

Thermal conductivity refers to a material’s ability to transfer heat. In general, aluminum has significantly higher thermal conductivity compared to cast iron. Aluminium has a thermal conductivity of 204 W/mK compared to the 46.1 W/mK of cast iron. This means aluminum is able to heat and cool faster and is more energy-efficient than cast iron. This means that aluminum can transfer heat more efficiently, making it a better choice for applications where heat needs to be rapidly conducted away from a heat source. This property makes aluminum commonly used in applications such as heat sinks, radiators, and cookware.

Aluminum vs. Cast Iron Strength

Aluminium offers good strength for its weight but does not compare to the stability provided by cast iron. Cast iron has higher tensile and compressive strength than aluminium, making it the better choice for applications where extreme force or pressure will be applied, such as in construction or heavy machinery parts where durability is vital.


When it comes down to choosing between aluminium and cast iron, there are many factors that you must consider, including cost, strength, conductivity, and density, along with other properties that may be important depending on your application or project needs, such as corrosion resistance or machinability. You must weigh all these factors together before deciding which material would best suit your needs so that you can make an informed decision about what would best suit your needs and budget requirements to complete your project successfully!


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