Re: [ATM] RE:anealing

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

Willmann-Bell doesn't make their glass. They buy it
from United Lens in New England.

--- Mel Bartels <mbartels@bbastrodesigns.com> wrote:
> > As far as I know the only sources for Pyrex blanks
> for ATMs are Newport
> > Glass and Wilhelm-Bell. The latter more expensive
> than the former but a
> > little more reliable. Both claim that they anneal
> the glass but there is
> > plenty of evidence to the contrary.
> 
> 
> The problem, seems to me, is more in the translation
> or adaptation of 
> 'anneal' to 'sufficiently strain free'.  There is
> not a strict coupling 
> between the two.  That is, a blank can be well
> annealed, yet have 
> objectionable strain.  Also, you need to watch the
> qualification of 
> 'annealed'.  Most QA testing is done with a small
> patch at the surface of 
> the glass.
> 
> Mel Bartels 
> 
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> 

Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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