Why do aluminum cream jars help extend the shelf life of cosmetics?

Aluminum cream jars are usually designed with aluminum-plastic composite lids or liner gaskets to ensure a highly sealed environment after the jar is closed. This tight sealing structure can effectively block the intrusion of air, moisture and microorganisms. Oxygen in the air will accelerate the oxidation of active ingredients in cosmetics, causing product failure; moisture may cause emulsification systems to stratify or breed mold. In addition, sealing can also reduce the risk of bacterial and microbial contamination, which is especially important for products with no preservatives or low preservatives.

Aluminum is a high barrier material that can effectively block the penetration of oxygen, light and moisture. First, the oxygen permeability of aluminum is almost zero, which can significantly slow down the oxidation and rancidity of ingredients such as oils and flavors, and maintain the freshness of the product. Secondly, the opaque nature of aluminum cans can block ultraviolet and visible light, preventing photosensitive ingredients from being degraded by light. In addition, the dense structure of aluminum cans can prevent the loss of water molecules and volatile components, ensuring the long-term stability of the product.

Aluminum has stable chemical properties, and a dense oxide layer naturally forms on its surface, making it corrosion-resistant and less likely to react with cosmetic ingredients. In contrast, some plastic packaging may release plasticizers or other chemicals, affecting product safety. Some aluminum cans are also coated with a protective layer such as food-grade epoxy resin on the inner wall to further prevent direct contact between aluminum and highly active or highly acidic and alkaline formulas, ensuring the purity and stability of the product.

Aluminum cream jars have high pressure resistance and impact resistance, and are not easy to deform or break during transportation or storage, thereby avoiding product leakage or contamination caused by packaging damage. In addition, aluminum will not age, become brittle or increase permeability over time like plastic, and can maintain stable protective performance for a long time, making it suitable for high-end cosmetics or special efficacy products that need to be stored for a long time.