I'm in line with the other posts on this...nix on the freezer. I'm running about 20 gallons in my tank which is a HDPE sterlite type of tank insulated and sealed in 6 mil plastic. I have ran up to 21 amps (4.5-6 amps/sq'), in my tank for the full 90 minutes with no problems with temp, however, I am heavily agitated with air from a regenerative blower set up. When it comes time for me to upgrade, I'll probably just put in a second tank for volume reasons rather than part size. A second tank would allow me to stagger the runs for custom dye work reasons. If size of the part alone is reason for upgrading coolers or tote tanks should work well. To the best of my knowledge, nitric acid is the only thing that would give you depolymerization issues. You should be safe with any pp,hdpe, or pvc construction.
EasTTeX
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