What metal is the chip in SIM cards made of?

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Kit Scribe2021-02-04 11:32:42

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Kit Scribe, 2021-02-04 11:32:42

Hello.
I'm interested in what metal the SIM card chip with the pad is made of, in order to understand what can oxidize it? I can't find this information on the net.
thanks for answers

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approximate solution, 2021-02-04
@kitscribe

https://www.quora.com/What-materials-are-used-for-...
RE:
The main component of a SIM card is an electronic chip made of silicon with some added impurities such as phosphorus. It is plated with metals such as gold to form the outer layer that comes into contact with your cell phone. This chip is inside a plastic shell.