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". Thanks in Advance.