Composition of Gorilla Glass

[Ron_Werner_Norway]

Hello,

I am new here, and hope this is the right place to ask a question like this.

I am a museum professional and am currently working on a small display on feldspar and its applications.

The use of feldspar in glass is well-documented, but I feel somewhat unsure about the use of feldspar in Gorilla Glass. Of course, there is some information on Wikipedia, but I still find the information ambiguous.

My questions are the following:

1.) Can anyone help me to find a chemical analysis of Gorilla Glass showing all the elements present? Not just the main components in terms of oxide, but also the trace elements? (for instance, boron, yttrium, lanthanum?)

2) Can anyone say something about the use of feldspar in the manufacturing of Gorilla Glass? Is it an essential component, or do other formulations exist, where the alkali elements (sodium/potassium) originate from other compounds?

3) Can anyone explain in simple terms why the ion exchange results in a glass that is so much more resistant and tough than normal glass? Exactly what happens structurally to the glass that causes it to be so strong?

I checked the glass of my own mobile phone, scratched it with quartz, confirming that its hardness is lower than 7.

Hopefully, there is someone with deeper knowledge on this subject, but thanks for your attention anyway!

Kind regards,

Ron Werner
Norway

[1emma19]

Gorilla Glass is generally an alkali–aluminosilicate glass, so the main oxides are SiO₂, Al₂O₃, and alkali oxides like Na₂O.

[Ron_Werner_Norway]

Thank you very much for your reply. I am looking forward to more detailed information on Gorilla Glass.

[1emma19]

You're welcome. Maybe Chien can help more with that.

[lmkeller0614]

Feldspar can be used as a raw material source for alumina and alkali oxides, but it isn’t strictly essential. Those same components can come from other inputs like sodium or potassium salts, so alternative batch compositions definitely exist. The strengthening comes from ion exchange. Smaller sodium ions in the glass surface are replaced with larger potassium ions. These larger ions create a compressive stress layer because they occupy more space but are constrained within the structure. That surface compression makes it much harder for cracks to start and spread, which is why the glass becomes more resistant even if its basic hardness doesn’t change dramatically.

[Ron_Werner_Norway]

Thank you for your time.

[lmkeller0614]

You're welcome

[JamieK]

Interesting discussion. One thing I find fascinating about Gorilla Glass is that its strength comes more from the engineered compressive stress layer than from extreme hardness alone. Many people assume it is “harder” than ordinary glass, but its real advantage is resistance to crack initiation and propagation.

I'd also be interested in seeing any published trace-element analysis, as manufacturers rarely disclose the full composition beyond the major aluminosilicate components.

[pigkang]

Hello,

I am new here, and hope this is the right place to ask a question like this.

I am a museum professional and am currently working on a small display on feldspar and its applications.

The use of feldspar in glass is well-documented, but I feel somewhat unsure about the use of feldspar in Gorilla Glass. Of course, there is some information on Wikipedia, but I still find the information ambiguous.

My questions are the following:

1.) Can anyone help me to find a chemical analysis of Gorilla Glass showing all the elements present? Not just the main components in terms of oxide, but also the trace elements? (for instance, boron, yttrium, lanthanum?)

2) Can anyone say something about the use of feldspar in the manufacturing of Gorilla Glass? Is it an essential component, or do other formulations exist, where the alkali elements (sodium/potassium) originate from other compounds?

3) Can anyone explain in simple terms why the ion exchange results in a glass that is so much more resistant and tough than normal glass? Exactly what happens structurally to the glass that causes it to be so strong?

I checked the glass of my own mobile phone, scratched it with quartz, confirming that its hardness is lower than 7.

Hopefully, there is someone with deeper knowledge on this subject, but thanks for your attention anyway!

Kind regards,

Ron Werner
Norway

Melon Playground Game
Gorilla Glass owes its superior durability mainly to its chemical strengthening process rather than to a unique use of feldspar or an exceptionally hard glass composition.