Glass is glass
In a Nutshell
Smartphone makers claim dramatic yearly improvements in glass shatter or scratch resistance (e.g., 3-4x better), but these traits are inversely related: boosting hardness for scratch resistance increases brittleness and shatter risk, while softening for shatter resistance worsens scratches—forcing companies to alternate focus across Gorilla Glass generations and Ceramic Shield. Independent tests confirm some gains, but factors like phone design (e.g., flat edges, bezels) contribute more than glass alone, and no version resists scratches from quartz sand (Mohs 7) or eliminates fingerprints without coatings. Glass is still glass—claims sound impressive but obscure unavoidable trade-offs.
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This phone is four times more shatter resistant than its predecessor. The next year, the phone is three times more scratch resistant than the year before. The next year, this phone is three times more shatter resistant again. Every year there's some line like this in a smartphone keynote. These claims aren't lies but are misleading at best because shatter resistance and scratch resistance are inversely related, working against each other.
It's like a slider: to make a material more scratch resistant, make it harder, but that makes it more brittle and susceptible to shattering. To make it less brittle, make it softer, increasing susceptibility to scratches. You can optimize for one, but it's essentially impossible to dramatically improve both at the same time. Keynote slides, ads, or web pages claiming a new phone is three to four times more shatter resistant sound dramatic; they're probably not lying but don't explain what it means. The subtext is it's likely softer and less scratch resistant, or vice versa.
Smartphone companies stack headlines like more scratch resistant, more drop resistant, alternating between them. Most modern high-end smartphones use Gorilla Glass from Corning. Gorilla Glass 1 was first used in the original iPhone in 2007, now on its ninth generation. Claims on Corning's website and info sheets alternate between big improvements in shatter resistance and scratch resistance.
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