Airgas also has "diving grade" Oxygen. They have filled exactly 1 cylinder of it, somewhere in Georgia. HP helium is 5.0, which if you're blending your own mixes is fine to use, it's like the difference between medical and ABO. If you are selling it, it is NOT breathing grade, where 5.5 is. On my Texas Airgas account, 5.5 helium is $95 per T. On my Key West account (yes, Airgas splits at Tallahassee) my 5.5 is $202 a T. If I needed a couple of pallets, I'd have it shipped.
Airgas has territories, and in Texas they go by Southwest Airgas.
I just did a search for Helium Grade 5.0 & 5.5 vs. HP & UHP on Airgas website. This is what I found.
Welding/Balloon = (99.995%)
Diving = Grade 4.5 Helium (99.995%)
Grade 4.8 = HP Helium (99.995%)
Grade 5.0 = UHP Helium (99.999%)
Grade 5.5 = UPC (Ultra Pure Carrier) Helium (99.9995%)
Grade 6.0 = Research Helium (99.9999%)
Even tho each grade appears to be similar, there are other requirements for each grade.
Took a phone call to Airgas to find the Diving grade percentage. I was told HP is the minimum for Breathing Helium, but they recommended UHP or the Diving Grade. Go figure that one.
I just notice "Diving Grade" Oxygen and Argon on Airgas website yesterday. WTF is up with "Diving Grade" Argon? I would just use Argon gas for welding; it's not like you breathe that stuff.