And the winner is Mild Steel. Thanks for the replies.
plex, mylar, micarta, teflon, aluminum, liner material, etc...
Counter top material often called Formica is the very best for patterns, It grinds well and holds it shape with lots of use . As well it doesn't chip and often for the sizes we use,can be had for free from a cabinet shop. It's a try it you'll like it material. Frank