Aluminum alloy auto heat sink casting housing with passivating. Aluminum alloy is the best popular material in heat sink make. Compare with iron high pressure cast, aluminum alloy is ligter than iron, just a third of iron for same size. Aluminum alloy heat sink is safe and reliable with high thermal efficiency. And has a good thermal conductivity, energy saving and environmental protection, long service life. This aluminum alloy die casting housing applied in vehicle to prolong car’s life.