Kevin:

Are you cleaning off the flux residues?  If this is a no-clean 
process, and you're leaving residues on, then interactions between 
the chemistries become more important.

-Joe 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Monday, April 19, 2010 11:18 AM
To: [log in to unmask]
Subject: [TN] Flux-Cored Wire Solder: Halide / Halide-Free

Greetings,

I've recently been looking into changing out some solder materials.  I was forced to change solder pastes due to product obsolescence.  I am now in the process of verifying compatibility of the hand soldering fluxes and solders with the new paste.  My current paste is halide-free.  My current flux cored wire solder is not.  I asked a supplier about halide-free flux-cored wire solder and the basic response is that you can get it, but it's really non-standard, so it's a lot more expensive with larger min-buys.  Indeed, after I looked at a few websites about product offerings, it appears most flux-cored wire solders are not halide-free.  I understand that I can basically use any materials I like as long as I test it out and can prove my "recipe" is safe to the overall product reliability, but seemingly halide-free is a safer way to in general.

So I am wondering:

1) Am I worrying about nothing (matching halide-free paste with halide free solder wires)?

2) Is it really not all that common to use halide-free flux-cored wire solders?

As always, thank you in advance...

Kevin Glidden

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