The Why, When, and How of Leak Checking a …

9/25/03 9:50 AM Page 2. The Why, When, and How of Leak Checking a Vacuum Furnace tate or reciprocate are other prime Tofferhecoming use of vacuum furnaces is be- more popular since they a number of processing advan- leak sites. tages, especially in critical applications, What is leak testing? provided they are properly main- In general, leak testing involves tained and kept in good operating measuring the amount of leakage condition. (vacuum degradation) over time in A common problem experienced the vacuum environment. The leak- by almost every user is that, over time, up rate of a vacuum system is a func- leaks develop that are both damaging tion of actual (real), internal (through), to product quality and to furnace in- and virtual (outgassing-related) leaks ternal components.

mains essentially the same, then an ac-tual (real) leak may be considered the primary cause. In most cases, both leaks and out-gassing are present simultaneously.

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