Re: [ATM] RE:anealing

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> 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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