[tinwhiskers] Re: Exemption on high temperature lead solder
- From: Engelmaier@xxxxxxx
- To: ed.parnagian@xxxxxxxxxxx, tinwhiskers@xxxxxxxxxxxxx
- Date: Wed, 27 Aug 2008 15:30:36 EDT
Hi Ed,
To your question as to what characteristic(s) of the high lead-content solder
makes it vulnerable to the transition from eutectic SnPb to SAC305, here are
some examples:
1) SAC is stiffer (higher modulus)--results in higher stresses;
2) SAC creeps slower--results in higher stresses;
3) SAC is stronger--results in higher stresses.
Werner
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