I have a specific question about vacuum impregnating a ferrite pot core transformer that's really loud at 10kHz. Most people suggest using epoxy, but I'm looking for a liquid with low viscosity that can really seep into the windings. Any recommendations?
3 Answers
Epoxy can actually work well since there are various types with different viscosities. I’d suggest not ruling it out completely. If you do go that route, make sure to vacuum out as much air as possible from the transformer. Curing it in a pressure pot after could also help reduce voids, which would improve the outcome overall. Also, there's MG Chemicals' insulating varnish, which is super thin and should work nicely for what you’re trying to achieve!
You can also consider thinning epoxy for better penetration. Just a little denatured alcohol or Everclear can go a long way! Just remember to add it drop by drop to keep the viscosity in check. It might be beneficial if you find the standard epoxy too thick for your transformer.
Shellac was traditionally used for coating coils and might be worth looking into if you're going for a more classic approach. Just something to think about!