Aluminum finned heatsinks were designed to provide power supply units with proper thermal conditions due to the most efficient area of heat dissipating surface.
We use duralumin to receive the best heat-transfer coefficient and minimal unit weight. Heatsink has an anodic oxide coating — to prevent corrosion. Also this type of coating provides heatsink with flat black color. As a result, emissivity increases up to 0.88–0.9, as well as heatsink's thermal absorption/emission.