Gorilla Glass: The Material Nobody Wanted Until Jobs Called
Zusammenfassung
The original iPhone’s screen was planned to be plastic. About six months before the June 2007 launch, Steve Jobs called Wendell Weeks, CEO of Corning Glass, and demanded scratch-resistant glass in sufficient quantity for the entire first production run. Corning had invented the chemically strengthened glass that became “Gorilla Glass” in the 1960s (its “Chemcor” process), manufactured a small amount, found no large market, and shelved it. Jobs ordered enough for the iPhone production run. Corning converted a Kentucky plant in months — the production line started in May 2007 and had made enough glass by June. Every subsequent smartphone screen is made of Gorilla Glass or a chemically-strengthened equivalent.
The Problem With Plastic Screens
The iPhone prototype that Jobs was carrying in late 2006 had a scratch-resistant plastic screen. He had been carrying it in his pocket with his keys. Within weeks, the plastic was scratched. Jobs, who cared intensely about the permanence of Apple products’ appearance, decided the screen material was wrong.
He called Wendell Weeks at Corning, explaining that he needed chemically strengthened glass in volume by the iPhone’s launch date. Weeks told him the glass existed — Corning’s Chemcor process (1962) used an ion exchange process to strengthen glass at the surface, replacing smaller sodium ions with larger potassium ions under heat, creating compressive stress that resisted scratching and cracking.
Corning had manufactured Chemcor glass in the 1960s for applications including car windshields and pharmaceutical containers. The market had not materialized at scale. The process had been shelved but not forgotten.
The Six-Week Retool
Jobs told Weeks he needed the glass in a specific size, in enormous quantity, within six months. Weeks told him it was not possible — Corning had no plant making the glass at scale. Jobs told him he was wrong (“Don’t be afraid, you can do this”). This conversation — described by both Weeks and in Jobs’s biography — is a standard case study in Jobs’s management approach: combining genuine belief in what was technically achievable with pressure that turned “impossible” into “very difficult.”
Corning converted a factory in Harrodsburg, Kentucky, from LCD glass to Gorilla Glass and delivered the glass for the first iPhone production run on schedule. The iPhone was unveiled January 9, 2007 and went on sale June 29, 2007. The glass screen held up to keys in pockets in a way plastic had not.
Corning branded the product “Gorilla Glass” for the consumer market. It is now the standard material for smartphone screens worldwide — used in iPhones, Samsung Galaxy phones, and most other smartphones. Corning has sold over 7 billion Gorilla Glass devices as of 2023.
The Design Philosophy Behind the Decision
The Gorilla Glass story illustrates Jobs’s approach to hardware constraints. Most product managers would have accepted the scratch-resistant plastic screen — it was functional, cheaper, and the tooling was complete. Jobs’s response was that the user’s experience of the product over years mattered, not just at launch. A scratched plastic screen was not the product he wanted users to have.
This philosophy — “the user’s relationship with the product extends past the moment of purchase” — informed many of Apple’s material choices. Aluminum instead of plastic for MacBook bodies, glass instead of plastic for screens, a physical keyboard replaced by a screen that could display any interface. Each choice prioritized the product as a long-term object over the immediate cost. The full context of Steve Jobs and Apple covers how this philosophy shaped Apple’s product line.