Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Feasibility of using Flexible Graphite (Grafoil ) gaskets in High Vacuum Sealing Applications

Feasibility of using Flexible Graphite (Grafoil ) gaskets in High Vacuum Sealing Applications

Feasibility of using Flexible Graphite (Grafoil ) gaskets in High Vacuum Sealing Applications

Hello, I apologize in advance if this is the wrong place to ask this question, but I could not find any vacuum related forums. I am currently designing a thermal evaporation or PVD chamber that needs to reach a temperature of 600C and vacuum of 10^-7 torr. I originally planned on using a combination of Viton O-orings and Metal to Metal seals(CONFLAT)for the chamber but I am now considering using flexible graphite gaskets. The reasons for this are numerous, and have to due with the fact that graphite can withstand far greater temperatures and can seal micro cracks without the complexity of traditional metal to metal seals. My only issue is I have yet to find any literature regarding their use in vacuum systems and I have only seen information on it's use in aerospace and nuclear applications.

Am I just spit-balling here or is there some potential in this idea? Any suggestions in the right direction would be appreciated.

RE: Feasibility of using Flexible Graphite (Grafoil ) gaskets in High Vacuum Sealing Applications

I think gas permeability is going to be your greatest concern. We use Thermiculite 815 for our diesel engine exhaust systems. It absolutely blows graphite out of the water in terms of durability at elevated temperatures. They advertise a gas permeability of 0.06-0.17 mL/min by BS 7531 standard. I don't know if these are good numbers or not but there are many materials you can compare at their website.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close