What should happen to containers involved in a fire if they are made of aluminum or composite?

When containers made of aluminum or composite materials are involved in a fire, they should be permanently removed from service. This is because exposure to the high temperatures of a fire can compromise the structural integrity of these materials, leading to weakened or damaged containers that may not be reliable for safe use.

Aluminum may experience significant physical changes, such as losing strength and warping, making it unsafe for holding propane. Composite materials, while often durable under normal conditions, can also suffer from heat damage that is not visible to the naked eye, potentially resulting in leaks or catastrophic failures when reused. Therefore, for safety reasons, any containers that have been involved in a fire must be discarded to avoid the risk of leaks or explosions in the future.