Vacuum tubes are glass tubes employed to generate a solid, slag-free metal sample for analysis. This process involves creating a vacuum that draws molten metal into the tube.  Upon cooling, the glass shatters, leaving behind a metal pin sample for further analysis.

Good for all metals with a melt Temperature above 1775 F

Evacuated borosilicate tubing 0.139″ ID x 6″ length $40.50 per pack of 50 tubes

Tongs for the 0.139″ feature a 30-inch length and a 45-degree angle, which facilitates pulling samples from the bottom of the crucible.

Tongs designed for vacuum tubes 0.139″ are available $148.