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January 2010

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 13 Jan 2010 15:23:32 -0600
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Just a word of caution, use the flux very sparingly. WS-1208 is a water soluble flux classified as ORH1 (halide bearing). Another one that works just as well, if not better, is WS-619 which is also a water soluble, but halide free (ORH0) flux.
Both lend themselves to cleaning very well in a standard de-ionized wash process.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Sewell
Sent: Wednesday, January 13, 2010 3:20 PM
To: [log in to unmask]
Subject: Re: [TN] Return of the "Snotballs"

Let us know if Richard's suggestion works.  I tried spraying a board with liquid WS362-25 and had little to no improvement.  There's always lot verification before use on production.  I used our Readymix kit, which worked fine, while waiting for a replacement from the vendor.

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, January 13, 2010 2:58 PM
To: [log in to unmask]
Subject: Re: [TN] Return of the "Snotballs"

I was hoping you could tell me. 

The last time we were able to go back and touch the joints up because we
could touch every solder joint with an iron, but this time it's different.
We have a bunch of QFN's and BGA's on the board...

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Randall L Bock
Sent: Wednesday, January 13, 2010 3:28 PM
To: [log in to unmask]
Subject: Re: [TN] Return of the "Snotballs"

and with a vengance.. wow what a mess... what do you do to fix it??  

Randy Bock Sr.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory
Sent: Wednesday, January 13, 2010 3:24 PM
To: [log in to unmask]
Subject: [TN] Return of the "Snotballs"

Maybe some of you remember a post I made a couple of years ago when I was in
Tulsa and I had a reflow problem with a SAC solderpaste. It was then
I learned of a new term called "Snotballs". Here was the picture I posted
back then:
 
http://stevezeva.homestead.com/files/Snotballs.jpg
 
Well guess who decided to follow me out to Pennsylvania? Check out:
 
http://stevezeva.homestead.com/Type_4.JPG
 
Same vendor, same alloy.
 
All I can say is make sure you know where your powder is coming from. 
 
Steve Gregory

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