The magnesium alloy matrix composite is what is known as a syntactic foam: a type of composite material created by filling a metal, polymer or ceramic matrix with hollow particles. In this case, a magnesium alloy matrix is reinforced with hollow particles of silicon carbide, resulting in what the researchers claim is the world's first lightweight metal matrix syntactic foam.

This structure helps give the material a density of 0.92 grams per cubic centimeter, which is less than the 1 g/cc density of water, thereby giving it the ability to float on water and potentially be used in the construction of marine vessels that stay afloat even after experiencing damage to their structure. Furthermore, the researchers say it is also strong enough to withstand rigorous marine conditions.

Additionally, the material also boasts heat resistance properties that would make it a viable alternative to the lightweight polymer matrix composites that have been the focus of much research and development for use in both marine vessels and automobile components as a replacement for heavier metal-based components.