High dielectric strength, vacuum compatible glue

[1Keenan]

Hi all,

I would need an high dielectric strenght glue to fix PTFE or Hostaphan to the vacuum chamber wall in stainless steel, so the glue should be vacuum compatible.
Force against the bonding direction would be 50N, so if the glue has already 100N it would be good but I don't think it is an issue.

Any suggestion_

THank you

 

[jrmichler]

Bonding PTFE is not easy, it will require some sort of surface treatment first. A quick search using terms loctite adhesive vacuum found the following: https://www.idealvac.com/files/brochures/Loctite1CHysol_TechSheet.pdf. Master Bond and 3M also make low outgassing adhesives.

And here is a good article about adhesives for vacuum environments: https://www.machinedesign.com/fasteners/epoxies-and-adhesives-fit-space .

 

[Vagn]

Bonding PTFE is not easy, it will require some sort of surface treatment first. A quick search using terms loctite adhesive vacuum found the following: https://www.idealvac.com/files/brochures/Loctite1CHysol_TechSheet.pdf. Master Bond and 3M also make low outgassing adhesives.

And here is a good article about adhesives for vacuum environments: https://www.machinedesign.com/fasteners/epoxies-and-adhesives-fit-space .

As in the above reply, Hysol 1C is a good adhesive for vacuum, and is very similar in its properties to Torrseal.
NASA also has a database which gives the outgassing properties of many different epoxies.

 

[phyzguy]

I have had good success with Torrseal, but I don't know if it will adhere to PTFE.

 

[1Keenan]

Thank you for the replies.
Well, vacuum compatibility is one property I need, but I also need high dielectrict strength.
I found a product form MasterBond with very high breakdown but I cannot find it anymore...

 

[BtownRiot]

Thank you for the replies.
Well, vacuum compatibility is one property I need, but I also need high dielectrict strength.
I found a product form MasterBond with very high breakdown but I cannot find it anymore...

MasterBond is expensive, and in my experience, doesn't live up to the hype.

Cyberbond has a CA called 2240, that I often use. Works great on PTFE.

Another one I would try is Permabond ET538. It's a 2 part epoxy and it's extremely strong. we use it to adhere ceramic and PCB to steel.

 

[1Keenan]

I was checking Permabond web site. They have specific products for PTFE, but they do not specify dielectrict strenght.
Sent an email

Cheers
F.

 

[BtownRiot]

I was checking Permabond web site. They have specific products for PTFE, but they do not specify dielectrict strenght.
Sent an email

Cheers
F.

The ET538 that i use has a Dielectric Strength 15-25 kV / mm

 

[1Keenan]

that would be good!