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RE: Plate Glass composition
I'd just like to point out that there is a definite difference in
composition between plate glass (which is normal soda-lime glass, like
windows, bottles, etc) and borosilicate glass (Pyrex, etc.) Borosilicate
glasses are a much higher temperature glass.
Soda lime glass is typically 70% SiO2, 15-20% Soda, 5% lime (calcium oxide)
with smaller amounts MgO, Al2O3, etc. depending on manufacturer.
Borosilicate glasses are more like 70-75% SiO2, ~15% B2O3, only ~5% soda,
very little lime.
Physical properties (softening point, etc.) are way different.
Al Zielinski
GE Lighting
Cleveland, OH
Phone: 216-266-3349 DC: 8-346-3349
Fax: 216-266-6663 DC 8-346-6663
albert.zielinski@lighting.ge.com
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