CO2 cylinders are essential for industries like paintball, beverage carbonation, scuba diving, and industrial applications. Whether you distribute or store CO2 cylinders, understanding how long they last is crucial for maintaining quality and compliance.Unused CO2cylinders can last indefinitely if stored properly. The gas inside remains stable, but external factors like cylinder material, storage conditions, and regulatory testing requirements determine their usability over time. Conclusion: How Long Do Unused CO2 Cylinders Last? CO2 cylinders do not expire, but their usability depends on material, storage conditions, and hydrostatic testing requirements. Steel CO2 cylinders last 10–30 years if kept dry and