Maybe, I melted one once, a 2X3 when I sprayed it with Oven cleaner. Literally it just melted, I rinsed it off as quick as I could in a tub of water, then it just fell apart.

I have a couple of the stamped Record ones made from coticules, 4x6 I think. I have honed on them and was not impressed, I think they were more of a tool stone, chisels and plane blades, which is why they are stamped “Record”.