Here’s my box of polymer clay texture plates. You’ll notice that some of them are chipped — since I’m not a polymer clay person (though I’m learning), I used to just buy whatever polymer clay was on sale, not realizing that some brands are stronger than others.
Now I know to use FIMO or Kato Clay for texture plates.
My problem with breaking polymer clay texture plates is part of what led me to develop my Silicone Texture Plates. That, and my annoyance with metal clay sticking to unmounted rubber stamps. Silicone is inherently non-stick, so it makes a great choice for texture plates.
Now if I’m making a quick little texture plate for personal use, I am most likely to use an RTV 2 part silicone mold making material, such as Quick-Sil.