At what pressure are SCBA bottles typically filled?

SCBA bottles are typically filled to a pressure of 4500 PSI. This high-pressure filling is necessary to ensure a sufficient volume of breathable air is stored in a compact cylinder, allowing for extended use in environments where fresh air is not available, such as in firefighting or hazardous material situations. The 4500 PSI filling capability provides a balance between portability and air supply duration, enabling users to operate for significant periods in high-stress scenarios without the immediate need for refills. Additionally, this standard ensures compatibility with most breathing apparatus systems used across various emergency response agencies.