Cryo Material Selection, Insulation, 50 Kelvin
Cryo Material Selection, Insulation, 50 Kelvin
(OP)
Hi,
I've got an applications where I need an insulating washer/disk in order to insulate stainless from stainless at 50 degrees Kelvin. I need help in selecting a material to do the job. I.e. low thermal conductivity, durable enough at 50 K to take a compressive static load of approx 40 lbf. Performance, rather than cost, is is the most important characteristic in this case. Any Ideas??
Parameters: OD of washer ~2" Thickness ~1/4"(I can vary on the thickness if necessary but not on the OD). OD of footprint of 40lb load (compression spring) ~1.5".
I've got an applications where I need an insulating washer/disk in order to insulate stainless from stainless at 50 degrees Kelvin. I need help in selecting a material to do the job. I.e. low thermal conductivity, durable enough at 50 K to take a compressive static load of approx 40 lbf. Performance, rather than cost, is is the most important characteristic in this case. Any Ideas??
Parameters: OD of washer ~2" Thickness ~1/4"(I can vary on the thickness if necessary but not on the OD). OD of footprint of 40lb load (compression spring) ~1.5".





RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
Very difficult to find a better insulator of any material.
RE: Cryo Material Selection, Insulation, 50 Kelvin
Thanks jedward, wow, I would not have thought.... and lexan is relatively inexpensive. I'll look up the specs.
Before I read these last two posts, I was homing in on PTFE, Virgin Electrical Grade (ASTM D 1710). Operating temp range -328 deg F to 500 deg F (73.1K to 533K). I'll re-think my inks based on this new info. Thanks. I'll let ya know...
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
Have a look at this link:-
ht
personally I think Teflon is possibly your best choice.
desertfox
RE: Cryo Material Selection, Insulation, 50 Kelvin
This material is what we use as Safety Relief Valve seats, dealing with LN2 containing vessels.
Itascot
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
RE: Cryo Material Selection, Insulation, 50 Kelvin
It was called Kel-F when it was owned by 3M. Today it is owned by Daikin and is called Neoflon.
Due to some crosslinking, Neoflon is more rigid with higher yield strength. Also, PBY in Ontario Ca is the best place to get it. Compression molded is ideal over other forms (i.e. extrude.) Heat causes the material to degrade faster.
RE: Cryo Material Selection, Insulation, 50 Kelvin
Ciao,
RE: Cryo Material Selection, Insulation, 50 Kelvin
After talking with someone at PBY plastics, they said it has something to do with crystalinity. The more slowly they cool it down, the more crystaline it becomes during curing. I would guess that more crystaline = more rigid = better dimensional stability = less creep. NO?
RE: Cryo Material Selection, Insulation, 50 Kelvin