Lightweight aluminum is used as rods for a wide range of purposes. Aluminum is resistant to acid, rust and corrosion when exposed to air. There are a lot of reasons why it is so popular for external applications. With lower density, this lightweight metal allows a greater workload capability. No matter what kind of weather it is, aluminum rods are unaffected by it. In low temperatures, the material works well, but becomes increasingly tough and hard as the temperature rises. The round aluminum rod in smooth surface finish.