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Apple's flagship iPhone 5S uses sapphire glass as a rear-facing camera and Touch ID fingerprinting to protect the Home button, and it is widely rumored that Apple is likely to use sapphire glass screens in future iPhone and iWatch products.
Since both the iPhone 5 and the iPhone 5S use the Corning Gorilla Glass screen, the industry will inevitably pay attention to how Apple's sapphire glass screen will affect Corning's business. At the Morgan Stanley Technology, Media and Telecommunications Conference, Corning's senior vice president and Tony Tripeny succeeded in facing analysts' questions about sapphire glass and gorilla glass. The topic shifted to the shortcomings of sapphire glass.
Special case Penny said: "Compared with gorilla glass, we found that sapphire glass has a lot of shortcomings: the price is about 10 times more expensive, the weight is 1.6 times, and it is not environmentally friendly. The energy consumption of producing a sapphire glass is better than that of glass. It's about 100 times higher. It (sapphire glass) has a lower light transmission, which means it either darkens the device screen or shortens battery life."
Trippini admits that sapphire glass is really scratch-resistant, but it also points out that it will still rupture, and emphasizes that gorilla glass can withstand 2.5 times higher pressure than sapphire glass. He believes that sapphire glass is not attractive for consumer electronics devices.
Asked why sapphire glass is expensive and whether it is possible to reduce costs by increasing production, Trippeni cited three major problems in the production of sapphire glass: crystallization time is about 4000 times longer than Corning glass, and the melting point is higher than the latter. Much more; the inherent high hardness greatly increases the difficulty and cost of cutting; as the size increases, the difficulty of forming flawless crystals increases geometrically.
Terry Penny said: "If this is an attractive business, then we must have done it already." Finally, he said that one of the advantages of sapphire glass is the tempting name of "sapphire".
However, Apple clearly has high hopes for sapphire glass - we have seen several patents applied by Apple for sapphire glass production, processing and installation technology, and Apple has reached a $ 758 million cooperation agreement with sapphire glass manufacturer GT Advanced Technology. .
Terry Penny said that Corning has long been involved in the gem industry through direct and indirect methods. If the industry is really profitable, they have already increased their investment. He also revealed that sapphire is shaped 4,000 times longer than gorilla glass and requires a higher melting temperature. Due to the high hardness, both the processing difficulty and the processing cost will increase significantly. In addition, problems in the production process will also reduce the yield of sapphire products, which will greatly increase the processing cost. 
Recently, Corning executives relentlessly criticized sapphire glass for being "expensive, heavy and not environmentally friendly" in a conference call, saying that if sapphire glass is attractive, Corning has already started production, and claimed that Corning's Gorilla Glass is 2.5 times more compressive than sapphire glass.