Tin whiskers. If you use a pure tin solder then the electronics will grow little whiskers which will, over the course of perhaps 3 or 4 years, short circuit the system. Hmm, OK, has a good chance of doing so. The cure for tin whiskers is to add lead to the tin solder. This is now illegal because using lead is verboeten on environmental grounds. Thus we have a shorter life span for electronics. And yes, it is worth noting that the electronics which really does have to be reliable is not subject to the no lead rule.
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