Re: [ATM] Glass Blank Question

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Jason Lehmann wrote:

>Hi All,
>
> 
>
>I have a 15"  diameter by 1" thick piece of glass with a density of
>2.685g/cm3.  It looks like this disk is in the crown glass group.  Any ideas
>
I checked about 6 or so catalogs from multiple sources.  If the blank were
"newer" glass, some of the ECO flints (N-F2, S-TIM1, etc) fit [+/-0.035]
that density (also FN11 in the older glasses).  Other than that, the only
glasses that came up were some Crown-Flints (KF or CF) and the solitary
BK6 and KzFN1.  What else makes you think it is a crown?

>on what to do with this blank?  I would like to make a mirror out of it but
>I read somewhere that crown is not the best substrate for a mirror.  Any
>help would be appreciated.
>
>
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