The kind of aluminum used in cans generally varies among different parts of the can and their properties needed for making such. For beverage industries, 3004 and 5182 are the two major aluminum alloys. This alloy have specific properties for the can body and lid.
The best option for can body is 3004 aluminum alloy. This alloy is used due to its fantastic combining of strength and ductility which allows for deep drawing of the can — so thin yet hard. That strength is important, because cans have to withstand a lot on the inside from carbonation and the outside during transport. Research shows that a can made with 3004 alloy has approximately 25% more pressure resistance, allowing strength without additional weight.
The lid of the can, however gains from 5182 aluminium alloy, selected for its higher strength and puncture resistance. As the lid is subjected to open and internal pressure forces, 5182 has 30% better puncture resistance compared to other materials, mitigating risk of accidental leaks or breaks. This makes it perfectly suited to the pull-tab on the lid, which must withstand the mechanical stress of constant opening but should not contribute much weight.
Another thing that can make both the 3004 and the 5182 alloys perfect, is recyclability. Alloy 6083 and 6463 are both 100% recyclable, only relying on the “closed-loop” recycling system of the aluminum industry. Almost 75% of all aluminum ever produced is still in use today, which demonstrates the effectiveness of this metal as a sustainable material. Such recyclability responds to the growing consumer demand for greener packaging options.
Additionally, the types of aluminum for cans used for cans can help make them more cost-effective to produce. Manufacturers take advantage of alloys that combine strength, durability and lightweight characteristics for affordable production quality cans. Together, these reasons make 3004 and 5182 alloys the go to materials in industry that optimizes the trade-offs for performance, safety and sustainability in producing high-quality cans.