What are the two primary materials used to make scuba tanks?

Scuba tanks are primarily made from steel and aluminum due to the unique properties of these metals that suit the requirements of high-pressure gas storage. Steel tanks are known for their durability and resistance to damage, providing strength and stability. They are also more resistant to deformation under high pressure compared to some other materials.

Aluminum tanks, on the other hand, are lightweight and offer excellent corrosion resistance, making them particularly advantageous for use in saltwater environments. The lightweight nature of aluminum helps in ease of handling and transportation for divers. Both steel and aluminum also possess the necessary strength-to-weight ratio that enables them to hold compressed air, ensuring safety and reliability during dives.

While other materials like plastic and fiberglass may be used in various marine applications, they do not provide the necessary strength and pressure resistance required for scuba tanks. Additionally, carbon and titanium, although strong, are not commonly used in typical recreational diving tanks due to cost and manufacturing complexity. Copper and brass are not suitable materials for scuba tanks due to issues with corrosion and weight.