ATM Al2O3 vs B2O3 vs quartz

[Dominic-Luc Webb molmed <Dominic.Luc-Webb@molmed.ki.se>]

I am experimenting a little with glass these days,
building a simple kiln and learning about glass.

I have seen in print (The Potter's Dictionary by 
Frank and Janet Hamer) to my surprise that 
Al2O3 actually has significantly higher thermal 
expansion than B2O3 and that crystalline quartz 
has even higher thermal expansion. Since I 
have worked with (in order of melting point) 
borosilicate, aluminosilicate and quartz 
capillaries in my lab, I was a bit surprised to 
see that the softest and lowest melting of the 
above glass types, (i.e., borosilicate) also 
had the lowest thermal expansion. 

Is this really correct or am I not interpreting 
this information correctly?


Cheers,



Dominic

North 59 37' 30"
East  17 48' 10"

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Dominic-Luc Webb, doktorand


Lab:
Department of Molecular Medicine
Endocrinology and Diabetes Unit
Rolf Luft Center for Diabetes Research
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