Re: ATM zerodur et al.

[Alexander Yascovich <yas@kisa.iki.rssi.ru>]

>
>>>Has anybody worked with more exotic mirror materials such
>>>as Zerodur or Sitall?  Here are some basic questions I have
>>>about this these materials.
>>
>>They are not that exotic -  a lot of big mirrors are made of them. 
>>Zerodur is from Schott in Mainz and Jena/Germany, and Sitall is 
>>manufactured by LOMO in St. Petersburg/Russia. I think that the 
>>same stuff from Corning is called Cervit, but I'm not sure - 
>>correct me if I'm wrong.

Astrositall is manufactured not by LOMO but by LZOS in Lytkarino (small
town near Moscow)

>
>>>     1. How much would a 10 - 12 inch blank of these 
>>>        material cost?

Price for Astrositall here in Russia is about 60 US$ per kilogramm

>
>>>     3. What is their 
>>>
>>>                     coefficient of expansion 
>>>                     weight
>>>                     rigidity
>>>

AstroSitall has coefficient of expansion about 10e-7 and density about 
2.5 gr/cm^3


Alexander Yascovich,
Moscow
Russia