I have been testing acrylic in and out of a N2 bath. It is a very thick piece so it is holding up surprisingly well. I need to bond pieces of acrylic together for my application that will be submerged in N2.
In your experience have you used or know of any epoxy's that are cheaper that work at 77 K (-420 °F)?
I found this [epoxy] https://www.lakeshore.com/products/categories/overview/temperature-products/cryogenic-accessories/epoxy but it seems a little expensive.