Electronics > Mechanical & Automation Engineering

Epoxy molding, encapsulation, molds and stuff like that!

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Is this vacuum degassed BTW?  (Would imagine so, voids must kill the ultrasonics?)

Obviously, you need a two-piece (or more) mold to enclose it; or if it's still 1-piece, it's got to be fairly deep and slightly tapered (draft), and leaves a smaller free surface.  Molds can be rigid, or silicone rubber -- allowing some undercut and quite complex shapes to be made.  Filling sprue should be at the top, with a generous funnel to allow for expansion when vacuuming, or at least pouring when filling.  Then cut off the excess and you're good.


Silicone won't hold against PU expansion. The mould must be strong. They even take concrete sometimes. To hold the pressure

Err -- FYI, the polyurethanes used for potting are solid, non-foaming. :)  OP also corrected that to just epoxy.


Oh there is non foaming PU?
I was referring to this one

Btw if you experience air bubbles in your epoxy you could put epoxy in vaccum before pouring. It will get most of the air bubbles out. Also let it cure under pressure will help. Vaccum will get air out. Pressure will compress air and make air bubbles small


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