Metal ions in Pyrex-why?

  • Thread starter mbrmbrg
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  • #1
mbrmbrg
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Metal ions in Pyrex--why?

According to http://en.wikipedia.org/wiki/Pyrex#Composition" is composed of oxygen, silicon, calcium, and sodium.

I've Google Scholared to no avail...

Thanks!
 
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  • #2
Borek
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What purpose does the carbon serve in hemoglobin?

I would say - none. Glass composition was experimentally determined so that it has needed properties. Metal ions were not added for a "purpose".
 
  • #3
mbrmbrg
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Glass composition was experimentally determined so that it has needed properties.

From that statement, I would conclude that without the metal ions, glass does not have certain needed properties, and with metal ions, it does. My question is: what are those needed properties that are effected by the various ions?
 
  • #4
Borek
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Needed properties are temperature at which glass becomes soft, coefficient of thermal expansion, chemical resistance and so on. But I strongly doubt it is possible to assign single property to a single ion.
 
  • #5
mbrmbrg
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I hear that. But I really want to know!!! (Ah, if only that made a difference...)
 

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