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It has been suggested that the new chassis could be made out of a super-tough amorphous titanium alloy known as Liquidmetal. This alloy is used for a number of strange applications, from the SIM eject tool for the iPhone, as a bezel for expensive wristwatches, and as a projectile to pierce tank armor.
The lack of a removable glass panel on the back of the iPhone 5 will no doubt make the handset more robust, but it will also make removing the battery much more difficult.
It is likely that just as with the iPad 3, Apple will have to use copious amounts to glue to hold the iPhone 5 together, and this glue makes it very difficult to take apart for repair.
Image source: ETradeSupply.