I think I have the post to beat all posts about heat resistance LOL!
We have a wood-fired oven in our backyard and it gets VERY hot (not sure how hot, but hot enough to cook a pizza in 60 seconds hot). My Le Chassuer went in and out of that oven like Rocky Balboa, complete with music and fists in the air. Well, not quite - the handle shattered but the rest of it is in perfect nick.

But to be honest I wonder whether the Le Cruset handle would have fared any better?