Polycarbonate or Acrylic at -100 C, high stress?

07 May 2020 0 910 Report

I need 5 cm OD (2 inch actually) tubing to do multiple things at once:

A) insulate with temperature gradient of 120 C in less than 10 cm along the tube.

B) withstand stress of atmosphere inside and vacuum outside at MINUS 100 C.

I am finding conflicting info when comparing many web sites. Many suggest that working temperature of polycarbonate is around -40C while that of acrylic is around -170 C.

I am currently using G-10 (FR-4) thin pipe made by rolling thin sheet to several layers with epoxy, but the epoxy attachment is non-uniform and I always have vacuum leaks.

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