The only problem with this theory is that the coal slag is going to have a
high silica content, depending on its origin. Western coal slag will
actually be about 60-70% silica oxide.
David
(ex coal chemist)
67 BGT
71 BGT
At 03:47 PM 6/17/00 -0400, you wrote:
>I think the confusion is based on the word "sand" in sand blasting. If you
>go to a Auto Store and ask for "sandblasting" sand they usually give you coal
>slag without even a comment. Few people use actual "sand" because the silica
>in it causes cancer, doesn't work too well, and it does a rough job on your
>nozzles. I have used coal slag for a long time and haven't had any warping
>problems on my MGs.
>
>In any event, if you aren't going to sandblast it yourself (which by the
>original posting it seemed) then the choice of blasting goes mainly to the
>blaster... I'm sure they've got thier own preferences.
>
> -John
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