When beverage brands seek an alternative to heavy glass, the choice often comes down to PET plastic or aluminium cans. Both materials are widely collected and highly recyclable, but a comprehensive Life Cycle Assessment (LCA) reveals drastically different environmental impacts when you measure the energy required to extract, manufacture, and transport them.
[Image showing an LCA comparison of carbon emissions for aluminium smelting versus PET production] The most significant difference in the LCA of these two materials occurs at the very beginning of their lifecycles. The energy intensity required to create a virgin aluminium can is exponentially higher than that of a virgin PET bottle:
Both PET and aluminium perform exceptionally well in distribution logistics because they are significantly lighter than glass. However, PET offers a distinct supply chain advantage that aluminium cannot match: the ability to ship preforms. While empty aluminium cans must be shipped fully formed (meaning trucks are mostly transporting air), PET can be shipped as dense, compact preforms and blown on-site. Discover how this drastically cuts your Scope 3 emissions in Optimizing Pallet Space: Shipping Preforms vs. Finished Bottles.
Aluminium is famous for being infinitely recyclable without a loss of quality, which is a powerful sustainability metric. However, recycling aluminium still requires melting the metal at extremely high temperatures. Conversely, recycling PET into food-grade rPET is a highly efficient, lower-temperature mechanical process. When brands shift their portfolio to incorporate high levels of recycled resin, the LCA of PET becomes incredibly competitive. Learn how to navigate this transition in A Complete Guide to Circular Beverage Packaging.
