High dielectric strength adhesive.

[Lightium]

Looking for high dielectric strength adhesive that won't break the bank.

 

[tepalia02]

Hi, for what purpose do you need it? What materials do you need to join?

 

[Lightium]

I want to join rubber to what I think is bakelite, to seal it from 40KV.

 

[Papabravo]

Given the minimal thickness of the adhesive layer, I hardly think it is worth worrying about. Maybe I don't appreciate the geometry of what you are trying to do, but what you think you need makes no sense at all.

 

[Lightium]

Given the minimal thickness of the adhesive layer, I hardly think it is worth worrying about. Maybe I don't appreciate the geometry of what you are trying to do, but what you think you need makes no sense at all.

It's a high tension situation, Papabravo.

 

[Nigel Goodwin]

It's a high tension situation, Papabravo.

Well you're still giving pretty well zero information - but silicon rubber is commonly used as a sealant in high voltage circuits.

 

[Lightium]

yeah, I'll stick with silicone.

 

[rjenkinsgb]

yeah, I'll stick with silicone.

Just try to use a non-acid cure type, to avoid any possible future corrosion, if it is in contact with any metal.

 

[Lightium]

Just try to use a non-acid cure type, to avoid any possible future corrosion, if it is in contact with any metal.

I wasn't aware that there were acidic types, thank you.

 

[Papabravo]

It's a high tension situation, Papabravo.

Thank you, I gathered that and did not need for you to repeat it. I'm telling you that what you want makes no sense to me since the thin layer of adhesive between the rubber and the bakelite(?) won't do squat for you.

 

[Lightium]

Thank you, I gathered that and did not need for you to repeat it. I'm telling you that what you want makes no sense to me since the thin layer of adhesive between the rubber and the bakelite(?) won't do squat for you.

It's a thin layer but long and wide.

 

[Papabravo]

Good luck with your quest.

 

[rjenkinsgb]

I wasn't aware that there were acidic types, thank you.

The commonest type is "Acetoxy" silicone - the stuff that smells like vinegar as it's setting. It releases acetic acid as the curing reaction takes place.

Make sure it does not say that; look for "Neutral cure" silicone.

The non-acid type is rather slower setting - but also much longer tube life, it can be good for months or even years after unsealing as long as you close or plug it, while the common type is pretty much guaranteed to set in the tube or cartridge quite quickly once started.

 

[Dick Cappels]

Please remember to check around your seal for creepage from the high voltage circuitry by using a neon light with one lead grounded and the other lead bare to "feel around" for high voltage. Hold the neon lamp with a length (10 cm or longer) of a good insulator like a plexiglas rod. Of course you could do that with your fingers but I imagine 40 kV might hurt you if it doesn't do worse.

Keep one hand in your back pocket all the time your circuit is on. I have done some work at 40 kV, always having a "partner" to minimize risk. If any current is available it can make it truly scary.

 

[Lightium]

Tried it and it lights, but at 280Hz the supply sounds very scary(not willing to get closer).

 

[Lightium]

 

[Dick Cappels]

That looks painful alright!