After having these crystals analyzed by an outside lab it has been
confirmed that they are definitely Bioact crystals. I had already sent
the boards out for evaluation prior to receiving Joe's email or I
could've saved the $1000 bucks. Thanks anyway for the reply Joe.
Now I just have to determine if they pose any reliability issues for
other boards that may the same condition that have been shipped
already...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US
SSA)
Sent: Monday, August 06, 2007 12:43 PM
To: [log in to unmask]
Subject: Re: [TN] Strange crystal growth
Freaky looking, aren't they?
I saw this once years ago. We had cleaned a batch of boards with Bioact
EC-7R in a dishwasher-type system, and the boards then sat undisturbed
over a weekend, unrinsed, because someone forgot about them.
I think these are Bioact crystals, if you can believe that. One more
trip through the Bioact wash will make them disappear.
-Joe
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Wednesday, August 01, 2007 10:45 AM
To: [log in to unmask]
Subject: Re: [TN] Strange crystal growth
Indeed strange. Very few crystals have this acicular form, except metal
whiskers. My first reaction is have them analysed!
Brian
Davis, Larry wrote:
> We have a strange problem here and I was hoping someone could provide
an
> explanation. I had Steve post a couple pictures to his site for
> viewing, thanks Steve!
>
> We are seeing this crystalline growth all over a single assembly that
> was built back in Feb 07 and shipped to one of our customers who kept
it
> stocked in the original esd bag. They noticed it once it was required
> for use and returned it to us. The only thing in our process that I
> think could possibly be the root cause is that our board cleaner
solvent
> (Bioact EC-7R) was getting very flux loaded about that time but we
> haven't seen this on any other assemblies that have been built since
> then. We are using no-clean fluxes and only clean boards that have
high
> impedance circuitry. I find it very strange that the growth occurs on
> the plastic parts as well as the leads of components. Any ideas?
>
> http://stevezeva.homestead.com/files/crystal_growth.jpg
>
> http://stevezeva.homestead.com/files/crystal_growth_closeup.jpg
>
>
> Thanks in advance for your feedback!
>
> Larry Davis
> Hach Co.
>
>
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