Re: [ATM] RE:anealing

[Ken Hunter <atm_ken_hunter@yahoo.com>]

>From what I heard and seen at Kitt Peak years ago (and
probably severely outdated by now), the best way to
remelt PYREX is to pulverize it and mix before
remelting to get consistant glass. Mixing in the melt
stage is very difficult due to the viscosity (and of
course the temperature) of the molten mass.

Ken Hunter


--- Mel Bartels <mbartels@bbastrodesigns.com> wrote:
> > Hi Mel, can you please explain the cause of the
> remaining strains
> > to fill a gap in my knowledge of glass  ;-)
> >
> > For a guess i would think inhomogeneity from poor
> mixing,
> > anything else ?
> 
> That's what comes to my mind, also.  At the Univ of
> Ariz Steward Obs Mirror 
> Lab, they check each piece of 'pyrex' from OHara for
> index, and if out of 
> bounds, that piece is rejected from that melt and
> spin.  I don't know if 
> pyrex can be thoroughly mixed.  From my
> understanding, it's more an issue of 
> finding consistent blocks of pyrex from the initial
> casting.
> 
> Mel Bartels 
> 
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