Electronics > Projects, Designs, and Technical Stuff
Potting compund question
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coppercone2:
I wonder what they do to make thermal epoxy. Do they use different formulations for the base?

I thought it might just rely on screened additive to basic epoxy mixtures. Like between a particular mesh range (not a random powder). It would be nice if someone figured out some ratios so we can just make custom epoxy mixtures for various jobs instead of paying ridiclous fees for safe/reliable electronics. I bet you they are making 10x markup on the stuff just because no one knows wtf the process is. And it expires. Screw that.

I still wanna know why epoxy goes bad as soon as you break the seal and if you can just vacuum seal it to maintain its tube life.

Yea ima complain about this. Spend 150$ a year in handy epoxy tax or get random work delays. Shitty deal. Just keeping JB weld, peramtex black plastic weld and a conductive epoxy. Let alone loctite prices  :--. Talk about bourgeoisie. Freaking edible items keep better then glue! It's crazy.
Zero999:
What's the current?

I don't see the need for many rectifiers in series, at these low voltages. The 1N4007 is rated to 1000V and is cheap.

I agree, there should be no need to pot, for electrical insulation, but there might be a reason for mechanical purposes i.e. vibration and moisture ingress.
Wolfram:
I've used the RS 552-668 thermally conductive epoxy potting compound before. The thermal performance is pretty good at 1.26 w/mk. It's also available from Allied in the US, but at twice the price. There are alternatives from Electrolube, like ER2220. From your application, it sounds like you might get away with lower thermal conductivity, in which case this is a cheaper option: https://www.alliedelec.com/rs-pro-71006383/71006383/
innkeeper:
i was looking on one of the epoxy sites. they were selling "marble dust" or calcium carbonate as a filler for epoxy that also increased its thermal conductivity.  i also noticed that glass filled epoxies have a higher thermal conductivity, probably for the same reasons the filler increases it
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