Cool links there man.
But you're still off on using R290. It is not explosive. It's not even labeled as explosive. It's FLAMMABLE. It won't burn without oxygen. Storing is no problem. If you've got a leak in your system....it's either so small that you didn't notice it when testing it (and therefore barely letting any R290 out) or you didn't test properly.
R290 is mixed with another chemical that I don't feel like typing out right now, that makes it smell nasty. If you have a leak, it will be obvious.
What refrigerant do you use Bigben?
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