Of course any percentage of enriched air will increase the burn rate of materials, but at what percentage should I be guarding that cylinder with my life, so to speak?
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and a bit later:Historically, the dive industry has treated up to 40 percent oxygen the same as air, and any concentration of oxygen higher than 40 percent as if it were pure oxygen.
In other words, as with so many things, it depends.Even pure oxygen poses little risk when handled at a low pressure and temperature. Conversely, extreme damage has resulted at high pressure and temperature with just the oxygen content of air.
Of course any percentage of enriched air will increase the burn rate of materials, but at what percentage should I be guarding that cylinder with my life, so to speak?
Oxygen itself will not burn it is an oxidizer and fuel needs an oxidizer to burn so the higher the oxygen percentage and pressure the more intense the burn. This is why in a weld shop or industrial facility fuel gases and oxidizers are stored a specific distance apart so unless you have a fuel source stored with your dive cylinders there should be no issue.