Re: [ATM] Fused Quartz Blank

[Dominic-Luc Webb <dlwebb@canit.se>]

On Wed, 3 Oct 2007 vorblesnak@peak.org wrote:

> I usually build my tools out of concrete with a broken glass surface to
> grind on.  Part of my question had to do with the grinding surface on the
> tool, since the cost of the trade is one f4.5 tool to do the other blank
> with.  I normally use old window glass or flattened marbles.  However if
> the fused quartz is significantly harder, perhaps I should use pyrex on
> the tool.  Or maybe a good hard tile.

Mohs Hardness (from different references):

Quartz: 7
"fused quartz": 5.5-6.5
borosilicate (Pyrex?): 5.0
plate glass: 5.5
steel nail: 5.5

Dominic

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