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<p>[QUOTE=&quot;moreotherstuff, post: 237121, member: 56&quot;]There must be data out there on tumbling media.&nbsp; If you can find a rated hardness for porcelain media and test yours against it, that might be the easiest test.&nbsp; Mass would be another indicator.</p><p><br /></p><p>******* </p><p><br /></p><p>from Wikipedia:</p><p><br /></p><p>On the Mohs scale, a streak plate (unglazed porcelain) has a hardness of <b>7.0</b>.[/QUOTE]</p><p><br /></p>

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