Glad for you, delle.
Borosilicate glass = Pyrex, developed by Otto Schodt at Corning.
It has a lower coefficient of thermal expansion than most materials, which seems to make it an ideal telescope mirror substrate, Crypto...
Since it's essentially high-grade Pyrex, you're cooking now.
Rue Morgue - '08, '09
Black Rock Beacon - '10, '12, '13
(lux, veritas, lardum)
Bacon is forever.
Veni, vidi, pertudi. (We came, we saw, we DRILLED.) - BRC Division of Geology 2009-2013
I'm here until the serendipitous synchronicity is ubiquitous.