Posted by keith True on August 16, 2019 at 07:47:45 from (73.68.29.112):
In Reply to: Black Blast---NO posted by big tee on August 15, 2019 at 19:08:20:
I've used hundreds of tons of coal slag.Black Beauty,Black Blast,Patriot blast,different names but all coal slag.There are different grades of it,a lot of times what stores carry won't go through some peoples blasters.I've blasted lots of tractors,cranes,dozers,backhoes,and probably a couple hundred dump bodies.For equipment like that I have to use what they call fine grade.I never blasted anything where I could use what they called medium.I believe the bridge crews use that grade a lot,at least around here.Coal slag,(NOT coal dust)has a low free silica content.Almost zero,the warning labels on the rap sheets say treat as a nuisance dust.I always bought it at the power plant,there are plants set up at the coal plants that crush,screen,dry and bag the stuff.It comes 3000 pounds to the pallet.Coal slag is hard,and actually cuts when it hits.On sheet metal it can make a little cut and leave a little flap,and painting over it will bridge it with a little trapped air under it.That is all in a microscopic setting,and I personally don't think it amounts to anything in real life.Silica hits,and explodes sideways,cleaning off paint,rest,and leaving the surface pretty much untouched.
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