I don't think it would melt, in the classic sense. It is cast acrylic and fillers and as such would be a thermoset material. It would char before it would melt and run down the counter. It might loose most of it's physical strength but it would still retain it's basic form.
To bend corian it is slowly heated to between 320 and 350 degrees. Any hotter and it can be unrully to work with. Too high and it stinks and starts to look nasty. I wouldn't call it melting as much as festering.
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