Bricks for 42" Oven - Question about Refractory Bricks

[wthwaites]

Have you used any of those black bricks? They look like mag chrome bricks to me.
https://www.youtube.com/watch?v=fu4lAGp2PHc

Yes, I used them for the cooking floor.
Not sure what mag chrome bricks are...is that a good thing if they are?

[Petter]

I think he refers to the risk of forming hexavalent Chromium during heating if so.

Do you have a way of getting your bricks analyzed?

[wthwaites]

No, I highly doubt that I can.
Like I said in my first post, I got them from a cement manufacturing plant as they were being disposed of.
I have no idea what hexavalent chromium is...Should I be concerned???

[wthwaites]

Based on my research, Magnesium Chrome bricks have a density figure that doubles the bricks I have...