A356 aluminum is made up of 92.05% aluminum, 7% silicon, 0.35% magnesium, 0.2% iron, 0.2% copper, 0.1% manganese, and 0.1% zinc. A356 aluminum is strong, lightweight, and resistant to corrosion. It’s also less likely to fracture or develop fatigue cracks than other materials, which can lead to a longer service life.