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[* black] The front glass panel of the iPhone is constructed of Corning [link|http://www.corning.com/gorillaglass/index.aspx|Gorilla Glass], a chemically strengthened alkali-aluminosilicate thin sheet glass that is reported to be 20 times stiffer and 30 times harder than plastic.
[* black] [link|http://www.corning.com/uploadedFiles/Corporate/Gorilla_Glass/Assets/Video/Gorilla%20Glass_300k.wmv|Gorilla Glass] holds many advantages as the iPhone 4's front panel including its high resistance to wear and increased strength from a strengthening process.