Re: [ATM] what is the material

["Thomas Janstrom" <thomas@moiler.com>]

Hi Horace,

I'm going to assume that by "glass" you mean window glass (AKA soda-lime
glass). 

The main points are that borosilicate glasses (there are literally hundreds)
have (in general) a much lower co-efficient of thermal expansion than soda
lime glass, they are also harder than soda-lime glass, and some say because
of this they take a better polish (this is purely anecdotal, my experience
is the polish is about the same, but Pyrex type glasses can take a bit
longer to polish out, but this is just because they are a harder type of
glass). 

Borosilicate glasses are also more chemically resistant than soda-lime
glass; they also have a much higher working temp, and consequently a higher
annealing range, but this just technical trivia to most ATMs. 

Cheers, Thomas. 

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
horace r davis
Sent: Sunday, 20 May 2007 5:06 PM
To: atm@atmlist.net
Subject: [ATM] what is the material

borosilicate glass how do this compare to glass
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