Electronics > Beginners
Are there inject-able epoxy for injecting into electronic devices?
(1/3) > >>
engineheat:
I'd like find a type of transparent epoxy that I can inject into an electronic device (thru a drilled hole). The epoxy should cure and solidify all the internal components. Then, I'd like to saw it open. This is for quality inspection purposes.

I guess the epoxy should have a low enough viscosity before curing so it can flow well, and it should be clear when cured. Are there anything out there suitable for this?

Thanks
reboots:
I have had very good results with 3M DP-270 clear epoxy. It's an injectable 2-part epoxy with very low viscosity and long working time. It cures clear and very hard. Unfortunately it's somewhat expensive.

I use DP-270 to pot electronic sensor assemblies in machined polycarbonate rods. The rods have drilled channels to transfer epoxy to each sensor pocket, and I use a single injection point to flow epoxy throughout the assembly. You will ideally have gravity on your side, injecting from the lowest point and letting air escape from the top to minimize bubbles.

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Scotch-Weld-Epoxy-Potting-Compound-DP270/?N=5002385+3293242430&rt=rud

Available from McMaster-Carr:

https://www.mcmaster.com/7467a274-7467A17

Requires dispensing gun:

https://www.mcmaster.com/7467A41

And mixer nozzle:

https://www.mcmaster.com/7467A12

If the 3M epoxy is out of your budget, MG Chemicals 832WC is a bulk electronics potting epoxy which appears to have good characteristics. I have not tried it myself. You would need to devise your own injection method, perhaps a plastic syringe.

https://www.mgchemicals.com/products/potting-compounds/epoxy-potting-compounds/832wc-epoxy-encapsulating-potting-compound
engineheat:

--- Quote from: reboots on June 26, 2019, 02:54:24 pm --- You will ideally have gravity on your side, injecting from the lowest point and letting air escape from the top to minimize bubbles.


If the 3M epoxy is out of your budget, MG Chemicals 832WC is a bulk electronics potting epoxy which appears to have good characteristics. I have not tried it myself. You would need to devise your own injection method, perhaps a plastic syringe.


--- End quote ---

Thanks. If I use a plastic syringe, it's probably easier to inject from the top. Injecting from the bottom would require a good seal I assume. I'm tolerant of a little bubble in my application, as long as the part I'm interested in is bubble free. So I can probably get away with injecting from the top right?

rstofer:
Volume can be a problem.  Curing is an exothermic reaction and with sufficient volume, things get real exciting.  Depending on the volume being poured, injection isn't nearly as big a problem as cooling.
Gary350z:
Use "casting resin". It is thin, clear, gets very hard, and is easy to use.

Local craft stores carry it;
https://www.hobbylobby.com/search/?text=casting+resin
https://www.michaels.com/search?q=casting%20resin
https://www.joann.com/search?q=casting+resin

or google search;
https://www.google.com/search?rlz=1C2NHXL_enUS691US728&source=hp&ei=X6UTXe3CI4rbtQbnuYj4BQ&q=casting+resin&oq=casting+resin&gs_l=psy-ab.1.0.0l10.2799.2799..4685...0.0..0.91.183.3......0....2j1..gws-wiz.....0.HM3LmS05v34
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod