Patent ID: 11951713
Assignee: CORNING INCORPORATED
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 1:
2. The article of claim 1, wherein when glass having the composition of the borosilicate glass of the outer ply is formed as 100 polished, flat samples of 1 mm thickness with a major surface of 2×2 cm2 area, and tested using square-based, 136° four-sided, pyramidal Vickers indenter directed orthogonally into a center of the major surface at 25° C. in 50% relative humidity and the indenter is quasi-statically displaced at rate of 60 μm per second to maximum 3 kg-force with indentation load held for 10 seconds, more often than not all cracks extending through the samples radially and/or laterally from the indenter are contained within a crack loop.