What are oxygen cylinders primarily made of?

Oxygen cylinders are primarily made of steel due to its durability and strength, which are essential for safely storing high-pressure gases. Steel can withstand the significant pressures that oxygen is stored under—usually up to 2000 psi or more. This characteristic makes steel an ideal material as it provides necessary protection against the risks associated with high-pressure gas storage, including potential rupture or explosion.

Additionally, steel cylinders are often designed with rigorous safety standards in mind, ensuring that they can endure repeated handling and are less prone to damage than other materials. While aluminum is also used for lightweight cylinders, especially in portable applications, steel remains the predominant choice for larger and more robust oxygen storage needs. Other materials like copper and plastic are not suitable for high-pressure applications due to their inability to withstand such conditions safely.