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first off let me say that this thing is ridiculous and just about as unsafe as i can imagine an extraction apparatus becoming, the stuff i have seen happen with glass tubes at much lower temps than this has left me with a bad taste in my mouth with glass. though i will say that if you were to fill this bad boy up and pack it in dry ice after a couple mins you could probalty let it soak and freeze for an hour or more then actually WAXTRACT those waxes out of there
It's definitely not unsafe. Read the thread.
I do both highh and low pressure chemistry in apparatus like this almost daily--and I've never seen one explode or implode, and the pressures I'm using are typically much higher.
The extractor is rated for pressures above what a butane can delivers, and it's coated so that shattering isn't an issue.
I don't own one, nor am I affiliated with these dudes.
In terms of safety this kicks the shit out of blowing butane through a tube. There is no question on that.