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Posted by David R. Birch on March 23, 2008, 7:43 pm
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Ned Simmons wrote:
> About 4-1/2# of what appears to be 120 grit blasting media. Looking
> at it under a microscope, it's uniformly graded irregular waferish
> particles of about .005 long. That, the fact that it scratches
> glass aggressively, and the gray-brown color, make me think it's
> more likely silicon carbide than aluminum oxide. Or it could be
> something else entirely.
>
> McMaster gets about $30 for 10# of AlO or SiC. If you want to
> gamble $10 thru Paypal for a Priority Mail flat rate box, it's
> yours. Otherwise, it goes into the driveway sand bucket.
It could also be garnet, which we use for abrasive in our waterjet at
work. Any ideas for a use for the garnet sand after its shoveled from
the waterjet tank? It will also contain fine particles of whatever we
were using it to cut.
David
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> at it under a microscope, it's uniformly graded irregular waferish
> particles of about .005 long. That, the fact that it scratches
> glass aggressively, and the gray-brown color, make me think it's
> more likely silicon carbide than aluminum oxide. Or it could be
> something else entirely.
>
> McMaster gets about $30 for 10# of AlO or SiC. If you want to
> gamble $10 thru Paypal for a Priority Mail flat rate box, it's
> yours. Otherwise, it goes into the driveway sand bucket.