A Fisher-Porter tube or Fisher-Porter vessel is a glass pressure vessel used in the chemical laboratory. The reaction vessel consists of a lipped heavy-wall borosilicate glass tube and a lid made from stainless steel. The lid is sealed with an o-ring and held in place with a coupling.
The advantage over steel autoclaves is that the progress of a reaction can be followed by eye, however the maximum pressure that can be achieved is much lower than that in a metal bomb. For example, typical pressure ratings are 7 bar for a large 335 mL Fisher-Porter vessel and 15 bar for a small 90 mL one, whereas the usual kind of bomb is safe to use with 200 bar.
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Famous quotes containing the word tube:
“Even crushed against his brother in the Tube the average Englishman pretends desperately that he is alone.”
—Germaine Greer (b. 1939)