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[ATM] Re: 40" mirror Annealing stats for Pyrex

Hey Jerry, Here is a site that has a few numbers about Pyrex and other 
glasses for that matter.
 

http://www.valleydesign.com/pr16.htm 

 

"Annealing Point: 560°C/1040°F
Softening Point: 821°C/1509.8°F " 

Mike Conron 

Jerry B. Hillman writes: 

> Hi Matt,
> I am looking into Cas, coude, etc. designs, but haven't learned enough about
> them to make a decision to go that route. This is only my third mirror.
> Succeeding on the simplest terms, ie. a Dob/Newt is probably going to be a
> challenge as it is without trying the exotic designs. 
> 
> Clear skies,
> Jerry 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
 


Mike Conron 
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