The guys at IntoMobile found a story about two electronic engineer who set out to discover just how much heat a SIM card can take before the data becomes unreadable.
12 SIM cards were collected in all. After using acid to dissolve their protective covering, the bare circuits were placed in heated air, allowed to cool, and retrieved. Six of them were subjected to 365 F (180 C), and the researchers were able to retrieve all the data from the cards. Five were then heated to 842 F (450 C), but only one of them was readable–and at that, only briefly. The final card, heated to 1,202 F (650 C), was completely unreadable with the methods employed.
The two researchers, Benjamin Jones and Tony Kenyon from University College London, stated that cards would likely be recoverable when heated to 842 F or above if better recovery methods were used.
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