"220V Cooling Fan" heat transfer coefficient is naturally the higher the better, but it also needs to take into account the mechanical properties of materials and prices. High thermal conductivity of gold, silver, due to soft texture, density is too large, and the price is too expensive to be widely used; iron due to the thermal conductivity is too low to meet the performance needs of high heat density of occasions, not suitable for the production of air-cooled computer fins. Heat transfer coefficient "220V Cooling Fan" copper also high, due to insufficient hardness, density, higher cost, difficult process and other unfavorable conditions, the use of computer-related fin less, but in recent years with the to improve the cooling equipment performance requirements, more and more part or all of the radiator with a copper material. "220V Cooling Fan" aluminum as the highest metal content in the crust, because the higher thermal conductivity, low density, low price and favored; but due to the small aluminum hardness, in a variety of applications in the field often mixed with a variety of recipes material aluminum, aluminum send this do not have access to many features from the ideal choice for fin materials processing.