Homebrew PCBs

Alan King <alan@...> wrote:  JanRwl@... wrote:

>"Tinpest" is NOT a problem with  "tin solders" with other  metals ALLOYED in 
>with the tin, even when only 1% or so!  Only "pure tin"  can get tinpest below 
>freezing!
>
When  SAC solder is already shown to have problems with tin pest, chances are  SA has a probability of having problems, and SC would be worse. The  1%Pb as mentioned earlier will alleviate the problem, and its hoped  that contaminants within SAC other than lead will do the same. (Notice  the term hoped). The EU directive comes into effect in mid year 2006,  and CA here in the US is probably going to adopt something similiar.
  
  There are other problems with SAC that are also starting to show.  Strange unexplained fractures, that are not a function of low  temperature has the medical community really concerned. The probability  is low, really low, so it may not be a big deal for stuff we do, but  for those in high volume, or mission critical apps, its going to be a  major concern.
  
  I know I would not want to be in consumer electronics customer service  for the next couple years.Its going to be a nightmare, but then again  when politics rules over science and economics, that tends to happen.
  
  The only good part is that perhaps the solder metallurgists have this  solved, and are just keeping quiet on it, until **it hits the fan for  their competition.
  
  Ron
  
  Here are some references off google
  http://www.semiconfareast.com/pbfree.htm
  http://www.indium.com/drlasky/files/TinPestPaper0723Final.pdf
  


		
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