These mixes are always blended into oxygen serviced cylinders.
Pure oxygen scuba tanks.
So the short answer is pure oxygen is generally bad and sometimes toxic.
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Several risks are associated with the use of pure oxygen in diving.
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To understand why you need to go into some detail your lungs are basically a long series of tubes that branch out from your nose and mouth from trachea to bronchi to bronchioles and end in little thin walled air sacs called alveoli.
While oxygen compatible lubrication of the neck threads and o ring in scuba valves and cylinders is probably harmless under ideal conditions it also has no clear benefit.
Because the final mix in the cascade cylinders has an oxygen content of 40 percent or below a diver s scuba cylinder is not required to be oxygen serviced.
These shops mix into oxygen serviced cascade cylinders.
For deco mixes above 40 percent there is simply no choice.
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Diving with pure oxygen can kill a diver even at shallow depths.
The dgx premium o2 valves are not any more so in those characteristics than any other scuba tank valves we sell.
This air contains about 20 9 oxygen.
As a certified scuba diver i learned that breathing pressurized pure oxygen leads to oxygen toxicity which can be fatal.
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However i m not anywhere near an expert on the mechanism of oxygen toxicity but i believe it has to do with resulting in a lot more reactive oxygen species which can cause oxidative stress and lipid peroxidation.