Jean-Francois,
you may visit Steve´s page
http://stevezeva.homestead.com/index.html
there still is a picture up showing dendrites.
Thanks for his picture service
Wolfgang
> -----Original Message-----
> From: Bissonnette, Jean-Francois [mailto:[log in to unmask]]
> Sent: Thursday, March 21, 2002 10:41 PM
> To: [log in to unmask]
> Subject: Re: [TN] Dendrites growth
>
>
> Thank you all for your answers.
>
> Anyone has a picture of dendrites?
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Thursday, March 21, 2002 2:44 PM
> To: [log in to unmask]
> Subject: Re: [TN] Dendrites growth
>
>
> In a message dated 3/21/2002 10:24:53 AM US Eastern Standard Time,
> [log in to unmask] writes:
>
> << Is conformal coating a good protection against dendrites? >>
>
> Graham's answer is a very good one. In a way, this question
> reminds me of
> an
> advertisement that I often saw in bicycling magazines during
> my college
> days.
> It was for a new type of lock to hold one's bicycle to the
> parking rack,
> and
> it had for a headline "Resists Atomic Bombs". The key being
> that it was not
> 100% successful, but it did offer resistance.
> In every comparative test that I have ever done, uncoated
> boards fared
> far
> worse than coated ones with respect to dendritic growth.
> Does that mean
> that
> conformal coating will prevent dendrites from EVER appearing?
> Clearly not.
> My typical tests were 100 hours at 85 C and 85% RH, with
> power applied, with
> the acrylic coated boards normally surviving the entire test and the
> uncoated
> boards failing in 2-8 hours, depending on the soldering
> process variables
> involved.
>
> Jon Moore
>
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