I took the following off a shot blasting web site...
Black Beauty Coal Slag
Black Beauty offers a fast cutting, low dusting abrasive which provides high
productivity, surface cleanliness, and surface profile.
... Hard Angular Particles, between 6 and 7 on the MOHS Scale
... Uniform Density
... Low Free Silica, less than 1%
... Chemically Inert
Free Silica is the part you don't want,.... sand versus this stuff, sand has
a much higher free silica component. Thats the stuff that gets in your
lungs and is nasty etc.
--John
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