(2) A substance that has been melted, then
allowed to solidify.
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Silica
Boron trioxide
Soda ash
Lime
A Pyrex glass beaker
Borosilicate
(Pyrex) glass used in most laboratory glassware is
manufactured by fusing silica (SiO2; essentially
highly purified sand), boron trioxide (B2O3),
soda ash (sodium carbonate;
Na2CO3), and lime (calcium oxide; CaO)
at high temperature, then allowing this melt to cool and
solidify.