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I've found the easiest way to vacate the Dabbler of unwanted residue is to burn it out. Take off the cone like you normally would to load and stand the pen upside-down on a flat surface that you can get dirty/sticky. With the heater upside-down and pressed against a flat surface press the...

From another forum: I have some reservations about this use of r134a. I have worked with tetrafluoroethanes in my lab and we take additional precautions not to inhale any gases from a fluxing reaction where tetrafluoroethanes are used because they tend to produce gaseous HF above about 250...

Very curious as to the temperature/pressure conditions in your extraction vessel.