Where can one find outgassing data for various materials?

General discussion
1

Hi,

I’m new to MolFlow, trying to use it to check the design for a ultracold-atom vacuum chamber. However, I find it hard to get outgassing data for various materials and for different gas species, e.g., inert gas from stainless steel, fused silica, borosilicate glass, etc. Does MolFlow contain data for some common materials? Is there a good source/database for such information?

Thank you very much!
Best regards,
Vincent

2

Hello Vincent, and welcome to the Molflow forum:
You can find outgassing rate data on most vacuum technology handbooks. If you can’t get one you can still find some data on, e.g., the proceedings of the last CERN Accelerator School (CAS) dedicated to vacuum for accelerators, held in 2017 in Glumslov, Sweden.
The link to the event page is here

The CERN Accelerator School

… then click on “Programme” and you’ll get to a page with the courses’ timetable during the week.
If you click on the first course of Tuesday you’ll get the excellent introduction by our Vacuum Group group leader Paolo Chiggiato, an expert in the field.
Good luck!

P.S.: there’s no inert gas desorption from stainless steel, unless the steel has been intentionally “charged” with some.

3

Thank you very much Roberto! (Looks like a great introduction.

4

I have seen desorption of Argon used for welding the SS when we exposed it to UV light from Titanium vacuum arc gettering. We had to vacuum bake those chambers to outgas the Argon.