Lots has been written in different threads re: dangers of silica.
Taking more than a hint from Gareth,
Quote:
Originally Posted by Gareth Davies
How about expendable shot blasting media such as aluminium oxide or copper slag? .....
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As I was researching a new low silica sand for my blast cabinet, I read that Black Diamond has very low silica content. So I looked up the MSDS on Black Diamond, it has less than 1% silica content, in fact, according to the document referenced below,
Black Diamond is a readily available by-product of coal fired power plants here in the US, I paid $7.50 for 50 lbs at my local big box farm store recently.
It comes in 4 grits: extra fine through coarse. Here's the fine grit, works just fine in my blast cabinet. Also pounds just like the sand I removed from my bag, and no dust emanating from the Velcro closure like the play sand had.