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A problem I have noticed is that my 3 gallon vacuum chamber is made out of what looks like brushed aluminum. The top is about a 1 inch thick piece of plexiglass or something similar. But when I apply heat with the burner pad it ends up getting the whole vacuum chamber hot even the felt O' ring...

So you guys are talking about 12-24 hours as a starting point? I assume you need to keep the heat on it the entire time. But the vacuum can I just lock the valve off and turn off the machine? Or do I need to run that for 12-24 hours? Just to clarify, I would be using some 5x butane with a...

Thats the thing... How do I know when the solvent is all gone. Is it just gonna stop bubbling? And is that gonna take literally 12-20 hours or are we talking more like 1-2 hours?

I am wondering what people recommend for temperatures whilest vac purging. 130? 140? And how long? Till it stops bubbling? Or just a specific amount of time like 30 minutes.

Do you have any pics? I would like to see them.