That's a very good point, lol. The melting point of plastic is 212 Fahrenheit and the maximum temp I have the UTH set to it 90 (let me know if that is too hot or too cold, I'll change it). I guess reading about melting plastic bins in the reviews of heat pads is not the greatest idea. I have a terrible fear of fire and anything related to it (smoke, smoke alarms, fire drills at school, you name it) so I'm just a bit anxious.