[ATM] Pyrex vs Plate

[hermit at outofoptions.org (Ken Lowther)]

Quoting Robert Turner <RoTurner@ciber.com>:

> Is pyrex material for a mirror blank substantially better than an
> alternative plate glass blank? Is it enough to justify the extreme price
> difference of the two materials?
>

Depneds. ;-)

GOOD pyrex is better.  Size matters here too.  The smaller the blank, the less
the advantage of pyrex because the blank will cool faster so the 'bad stuff'
that happens as it cools is less noticable.


Hermit, holed up in Youngstown, Ohio