What I've read through so far is most are made of HDPE which can withstand up to 230F continuous. I've found a few blanket heaters for ibc totes, their thermostat ratings range from 130, 160 and 212F all claiming not to scorch. From one source it sounded like the tanks without cages were made thicker, around 1/2" thick. I haven't been able to find any temp ratings for totes yet. I'm looking at a few later this week.
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