One of the things that I wondered about was the words "Diving grade" as both Oxygen and Helium are both elements and as such is there not just one version?
In remission from Anorexia
At least some balloon gas has a lot of other gases inside - this is purely from the experience that the radio controlled shark balloons fly well with pure helium but are too heavy for balloon gas to even lift off...
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though it looks more like a generic SDS for Helium gas as contained in various supplied products such as balloon gas/diving gas/calibration gas/ purge gas/etc.
and as a bit of a professional pedant what the 100% bit actually says is :
Purity: 100 %
The purity of the substance in this section is used for classification only, and does
not represent the actual purity of the substance as supplied, for which other
documentation should be consulted.
which is a lot different to saying that balloon gas is 100% helium.
People that know more about these things than me have told me that they would use industrial grade gases down to around 60m. Past that depth they want the "proper" stuff. I suppose the pp of what ever impurities are magnified at depth
Remember anything you read on the internet was probably written by some guy sitting at home in his underpants! Including this !!
Illegitimi non carborundum
If in doubt, get the diveing grade and stop fretting about it on the dive.
Personaly i use welding grade and dont fret over it.
Amusingly the "diving grade Helium" is guarenteed to be 99.5% pure where as the N5 Industrial grade helium I use is cheaper and guarenteed to be 99.999%???? Go figure
I can tolerate some impurtitys in my diving grade but I need 100% 02 for my welding
Yep another welding 02er here.