vermiculite

[shoeswith]

I definitely went deeper than that. It routed well at that depth I think.

[Boyan Silyavski]

What about milling graphite block? It will hold more details.

[paul mc]

hi there

thanks for your reply , never thought about other materials , as it would depend what if any chemicals at in the graphite block ,
that would damage or rust the kiln elements , but it is a thought ,

thank you