Low outgassing Material

[Cky2]

What properties should I consider when picking a material for high vacuum application? The information I know is that the temp ranges from 190K - 320K. I am very new to this.

 

[3DDave]

Is it just a lump doing nothing? Go with rhodium, very nice and not boring like gold or platinum.

Perhaps some info on what the material will be used for will narrow the options.

 

[Cky2]

It is for dewar detector cooler, and from what I know the material can affect optics focus. Should I identify what the material is for the optics first?

 

[IRstuff]

What is this material supposed to be doing in the high vacuum? Is it the Dewar itself, or something inside?

Unless the material is strongly adsorbing, outgassing is generally not an issue, steel, other metals, optical materials, etc., are routinely used in high vacuum. We've even used G10 for thermal breaks in 25 K applications, as well as ceramic motherboards.

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[Cky2]

Sorry, its the Dewar itself. Inside contains a detector and window (will have to confirm).

 

[MagBen]

consider from three perspectives: 1, not absorb water/gas, so low affinity to water. 2. no sublimation. 3. dense (no porous). Highly polished 304L is a good common material for high vacuum. free machine version or high carbon is not good, tends to outgas. Refractory and precious metals are dense, and normally low outgassing.