Corning release Gorilla Glass 4, makes it shatter proof

Corning’s Gorilla Glass is the most popular and widely used cover glass that is used to protect smartphone and tablet displays. Today, Corning has announced  Corning® Gorilla® Glass 4, rated (upto) two times tougher than any cover glass design available in the market today.  Best design enhancement is that the new Gorilla Glass 4 will not break when the tablet/smartphone drops onto a hard surface.The new material is more resistant to scratches, has better surface quality, has better drop performance. Corning did rigorous drop tests to make the Gorilla Glass 4 lot more shatter-free as this was a widely reported enhancement request.

 “Corning® Gorilla® Glass has outperformed competing materials, such as  soda-lime glass and other strengthened glass, since it was introduced in 2007, and we’re always innovating to push the limits of what glass can do,” said James R. Steiner, senior vice president and general manager, Corning Specialty Materials. “With Gorilla Glass 4, we have focused on significantly improving protection against sharp contact damage, which is the primary reason that mobile devices break. Dropping and breaking a phone is a common problem, and one that our customers have asked us to help address.”

For more information on Corning Gorilla Glass 4, go through this pdf.

This video shows drop testing done by Corning on Gorilla Glass 4.

Benefits

• Enhanced retained strength after use
• High resistance to scratch and sharp contact damage
• Improved drop performance
• Superior surface quality

Applications

• Ideal protective cover for electronic displays in:
  • Smartphones
  • Laptop and tablet computer screens
  • Mobile devices
• Touchscreen devices
• Optical components
• High strength glass articles

Dimensions

• Available thicknesses 0.4 mm – 2.0 mm

Viscosity

• Softening Point (10 poises) 912 ˚C
• Annealing Point (10 poises) 646 ˚C
• Strain Point (10 poises) 596 ˚C

Properties

• Density 2.42 g/cm
• Young’s Modulus 65.8 GPa
• Poisson’s Ratio 0.22
• Shear Modulus 26.0 GPa
• Vickers Hardness (200 g load)
• Un-strengthened 489 kgf/mm
• Strengthened 596 kgf/mm
• Fracture Toughness 0.67 MPa m
• Coefficient of Expansion 86.9 x 10 /˚C (0 ˚C – 300 ˚C)

Chemical Strengthening

• Compressive stress ³ 850 MPa @ 90 µm DOL
• Depth of Layer ³ 90 µm

Optical

• Refractive Index (590 nm)
  • Core glass** 1.49
  • Compression layer 1.51
• Photo-elastic constant 30.3 nm/cm/MPa