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Consider the case of an aluminum CO2 cylinder tank and liquid propane, while propane itself does not react significantly with aluminum, moisture or impurities present in the propane could lead to corrosion of aluminum surfaces over time. This corrosion could potentially weaken the aluminum container's structural integrity and lead to leaks or failure. Steel is more commonly used for propane storage tanks due to its strength, durability, and compatibility with high-pressure liquids.