The diamond-shaped apertures Aluminium Expanded Mesh can provide different levels of permeability, depending on their size. It can provide privacy and diffuse light while still letting in air. For example, the expanded mesh on airport runways can safely disperse the air flow because of its air filtering effects. On a smaller scale, fine expanded mesh can filter impurities through electrochemical filtration, or in combination with other materials. Its durability and metallic properties make it an ideal filter.