Over time, impurities can build up in recycled aluminum making it less useful. These accumulated impurities include paint, labels on the aluminum as well as other metals. As of right now, this problem is manageable but can become a much more serious problem in the future. Lower grades of aluminum that are created can be used to make things like engine blocks that aren’t affected be its purity. The purest aluminum is used for more specialized applications such as circuits and airplanes. Steps can be taken to reduce these substances from the aluminum during the molten processing. However, these systems can be difficult to install in older factories. Instead, they should be added to factories that are being built. Much more research is needed to help fully develop the technologies needed to solve this problem.
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