Ed,

Your 2 cents worth really got me excited.

I attempted to ultrasonic cleaned in a   (Alkaline, PH 8 to 9) neutraliser
for 15 mins but the stubborn white contaminants still remained.

I shared your sentiment and am suspecting the contaminants to come from the
solder. The supplier will help analyse in their lead content on the same
batch used in production.

Could you elaborate the effects of low antimony?

Thanks for sharing.

----------
> From: [log in to unmask]
> To: [log in to unmask]
> Subject: Re: [TN] White Residue on solder joints
> Date: Wednesday, May 26, 1999 11:08 PM
>
> There are a few other things that I have seen to cause this.
>
> If it is indeed a lead salt, a quick swab with household ammonia should
remove it. If not, these
> could be "freeze lines" caused by either contaminants in the solder (have
you had it analyzed
> recently?) or a more subtle defect caused by low antimony (possessing
reverse TCE
> characteristics).
>
> Just my 2 cents worth,
>
>
>
> Ed Popielarski
> QTA Machine
> 10 Mc Laren, Suite D
> Irvine, Ca. USA 92618
> Ph: (949)581-6601
> Fx: (949)581-2448
> E-Mail: [log in to unmask]
> http://www.qta.net
> ASK ABOUT OUR BGA REBALLER!
>
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