With what grade of oxygen should an oxygen cylinder for diving first aid be filled?

An oxygen cylinder for diving first aid should be filled with either aviator or medical grade oxygen. Medical-grade oxygen is highly purified and meets specific standards set for medical use, ensuring that it is free from contaminants that could be harmful during treatment. Aviator grade oxygen is also suitable for use since it is designed for high-performance applications, like those in aviation and other critical uses, which similarly adhere to strict purity requirements.

Choosing either aviator or medical-grade oxygen ensures that the oxygen provided in emergency situations for divers is safe, effective, and meets the quality needed for human use. Other grades of oxygen, especially those used in industrial applications, may not meet the necessary purity and safety standards, making them unsuitable for medical or emergency diving first aid situations. Hence, using either aviator or medical-grade ensures adherence to safety protocols critical in diving emergencies.