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The leak-up rate you should be looking for depends primarily on the type of base metals you are trying to braze. As mentioned at the beginning of this article, any air leak into the furnace represents an influx of oxygen into the furnace. Metals vary considerably in their tolerance of oxygen, with nickel and gold being examples of metals that have a large tolerance for the presence of oxygen. That is, they will not oxidize to the point that there is any negative effect on brazing.
However, other metals, such as chromium, or base metals which contain titanium and/or aluminum in their chemistry, will be highly sensitive to the presence of any oxygen in the furnace. Thus, may I suggest the following as a guideline for vacuum-furnace brazing:
Tolerable Vacuum Furnace Leak-up Rates:
SOURCE: Kay & Assoc. Brazing Consultants