Re: [ATM] RE:anealing

[Ken Lowther <hermit@outofoptions.org>]

Hmm... And I was told that would lead to bubbles.

Ken Not Hunter

Quoting 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 probably severely outdated by now), the best way to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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