For the purposes of the RoHS legislation a solder (or any other homogeneous material for that matter) is considered lead free if the lead composition is determined to be below 0.1wt%

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Julie Silk
Sent: 27 February 2012 16:21
To: [log in to unmask]
Subject: Re: [TN] looking for suggestions for no-clean flux-core PB-free wire solder

You are handsoldering through hole, so you will want a wire diameter that will give you a good amount of solder in a small amount of time.  While you want thin wire (.010-.015") for SMT, you want thicker for TH, but I'm not sure of the exact diameter (.025-040?).  SAC 305, 2-3% flux so you get good wetting.  We use Alpha Telecore Plus or Kester 275, maybe others.  Just a note, the lead-free solder is not lead-free.  It usually has a Pb content betwee 300 and 700 ppm.  

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