Hercuglass - Ultra Break-Resistant Real Glass
http://hercuglass.com/
There’s a video demo of dropping a glass on concrete.

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From: Neville Munn 
Sent: Wednesday, 18 September, 2013 19:01
To: silver-list@eskimo.com 
Subject: RE: CS>safety of crystal

Yeah, I used that for a short time, kept breaking and cracking on my due to my 
ham fistedness...LOL. 

That stuff is too fragile for my rough and tumble handling.  If they could make 
that glass quarter of an inch thick I would consider going back to it <g>.

N.


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Date: Wed, 18 Sep 2013 22:01:43 +0100
Subject: RE: CS>safety of crystal
From: asifnathe...@hotmail.com
To: silver-list@eskimo.com


Hi all,

My general advice is that you use borosilicate glass for brewing that way you 
can significantly minimise the effects of anything leeching into the water and 
other interactions that may occur.
....