Schott Ag

Gunther Paulus

Peter Brix

Simone Monika Ritter

Silke Wolff

Ute Wölfel

Jochen Alkemper

Oliver Hochrein

Gordon Kissl

Irmgard Westenberger

Gerd Rudas

Katharina Alt

Inge Burger

Glass sheets with high refractive indexes (nd), layer composite assemblies including the glass sheets, methods for manufacturing the glass sheets, and methods of using the glass sheets are all provided. The glass sheets can be processed in a glass sheet manufacturing process and nevertheless have the optical properties of a classical optical glass. The glass sheets of the are highly transparent, resistant to crystallization, chemically resistant and highly refractive. The glass sheets have a viscosity-temperature behavior that is adapted to the manufacturing procedure with glass sheet manufacturing processes.

Highly refractive thin glasses

A glass element is provided that is made of a glass having SiO, AlO, BO, and NaO. The glass has a scratch tolerance that when scratches of 1 mm length are introduced using a Knoop diamond indenter which presses upon a surface of the glass with a force of 4 Newton and is displaced along the surface with a traverse speed of 0.4 mm/s, not more than 20% of the scratches have a noticeable width including visible chipping of more than 25 &#x3bc;m. In some embodiments, the glass, after chemical tempering, has sodium ions that are at least partially exchanged for potassium ions so that a compressive stress zone is provided at the surface of the glass. The compressive stress is at least 700 MPa and an exchange depth of alkali ions is at least 25 &#x3bc;m.

Glass element with high scratch tolerance

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Mainz, Germany

Gunther Paulus