VAPOR PHASE SEALING V005
Testing has shown that sometimes there is only vapor between the lapped mechanical seal faces.
This was observed in the nineteen sixties at Battle Memorial Institute in Columbus, Ohio when they conducted a series of seal face lubrication tests for the aircraft industry.
These tests introduced the asperity theory of face lubrication. This idea of creating a vapor at the seal faces by introducing heating was later picked up by some British seal companies and introduced as “vapor phase sealing”.