JPMorgan upgrades Corning, predicts 20% rally as it benefits from big broadband buildout ahead

When heated to a high temperature and then cooled, new chemical composition can change the way glass behaves. For Gorilla Glass, Corning narrows down the number of compositions to a few dozen, does more melting, then picks two or three candidates to test. It can take one to three years of testing to reach the one composition Corning ends up putting into the next generation of Gorilla Glass.