Open cell foam aluminum is a porous metal with interconnected pores and high surface area. It is made of aluminum or its alloys and has various applications in the fields of mechanical, thermal, filtering, and sound absorption. It can be manufactured through different methods, such as investment casting, powder metallurgy, space retainers, and direct foaming. It has advantages such as light weight, high strength to weight ratio, customizable performance, and corrosion resistance.

Open cell aluminium foam and closed cell aluminium foam have different structures and properties.

Open cell aluminium foam has interconnected pores that allow air and liquids to pass through, while closed cell aluminium foam has isolated pores that are impermeable to air and moisture.

Open cell aluminium foam is softer, lighter, more compressible, more sound-absorbing and more heat-insulating than closed cell aluminium foam. Closed cell aluminium foam is firmer, denser, more impact-resistant, more resilient, more water-resistant and more vapor-resistant than open cell aluminium foam.

Open cell aluminium foam is more suitable for applications that require permeability, flexibility or sound absorption, while closed cell aluminium foam is more suitable for applications that require strength, durability or water resistance.