There are other competitor materials around if you check with the kitchen suppliers. There tends to be fewer colour and pattern choices though the composition is virtually identical to Corian. In fact when I was in the plastics business in the 80s, ICI brought out a version and I still have a couple of small samples I use as cup mats.
I've fitted a number of Mistral worktops including our own and the standard thickness for that material is 25mm with 12mm available also for splashbacks. i have some off cuts of 3 of the patterns but nothing exciting.
Mistral | Karonia Solid Work Surfaces for Kitchens, Bathrooms, Educational and Retail Worktops
Bob