So I imagine that most people when they shatter the glass on their phone its because of compression of the glass. I found this http://abrisatechnologies.com/doc

So I imagine that most people when they shatter the glass on their phone its because of compression of the glass. I found this http://abrisatechnologies.com/docs/AT%20Specialty%20Glass%20Technical%20Capabilities%20Brochure.pdf http://abrisatechnologies.com/docs/AT%20Specialty%20Glass%20... that says gorilla glass has a compressive strength of 800 MPa, and this http://www.roditi.com/SingleCrystal/Sapphire/Properties.html http://www.roditi.com/SingleCrystal/Sapphire/Properties.html says that sapphire has a compressive strength of 2.0 GPa. Additionally the flexural strength of sapphire appears to be ~20x higher then any of the "bending strengths" listed in that pdf