I worry about the expanded PVC or Foamed PVC same thing. It out gases at a pretty low temp still higher than what you keep any of your animals at but not much. That is the main complaint of PVC in cage manufacturing. It is so light and strong and inexpensive that is why its so common. I have never heard of out gassing problems from steralite tubs. All plastic will out gas its just at what temp it happens. Its a good question and honestly I don't really know, but it might be worth a call to steralite.
Chuck
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