Here is info on Black Diamond Blasting material

[RichE]

For all of you who are smarter then me and knows what all this stuff is LOL

http://www.reade.com/products/2-aluminum-oxide-fused-barium-titanate-boron-carbide-boron-nitride-burundum-calcium-carbonate-calcium-phosphate-cerium-oxide-chromium-oxide-clay-hard-burned-diamond-glass-iron-oxide-lamp-black-lime-magnesia-manganese-dioxide-mullite-pe/56-black-beauty-blasting-media-black-beauty-abrasive-black-beauty-blast-black-beauty-blasting-medium-boiler-slag-coal-slag-slag-blasting-abrasive-grit-shot-blast-media-blast-medi-roofing-granule-mil-a-22262bsh-cas68476960-

[Michael Zebrowski]

I got through the first couple of paragraph and now my head hurts, but now we know there are several grit sizes.  Will pick up a bag or two this week.

Thanks, Rich!