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Need help to get hermetic seal of insert molded wire

Need help to get hermetic seal of insert molded wire

Need help to get hermetic seal of insert molded wire

(OP)
I am prototyping a small plastic plug molded over a 1mm wire and I need to achieve a reliable hermetic seal between the plastic and the wire insert.  The wire is defined but the plastic is not.  Any suggestions with respect to getting a good seal?  Best resins to sample?  What effect do fillers have?  Tooling or processing tricks?  Any help from someone who has tried this would be greatly appreciated.   

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