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August 2009

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Subject:
From:
"Temkin, Gregg" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Temkin, Gregg
Date:
Thu, 20 Aug 2009 11:52:25 -0700
Content-Type:
text/plain
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text/plain (88 lines)
To continue with Brian's track, it's common with heavily solvent loaded conformal coatings (spray processes materials are often thinned with additional amounts of solvent) to see bubbling if the solvent if its not allowed to evaporate out of the coating prior to the outer surface curing curing.  Excessive applied thickness will also promote bubbles.  The sprayed boards should be allowed to sit and reach a handling cure before being heat cured.

Gregg

-----Original Message-----
From: Inge [mailto:[log in to unmask]] 
Sent: Thursday, August 20, 2009 11:32 AM
To: [log in to unmask]
Subject: Re: [TN] Manual spraying

Cured for one hour at +80 Centigrades. We have not done microscopy  when wet 
(the cards).
Inge


----- Original Message ----- 
From: "Brian Stumm" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 20, 2009 8:21 PM
Subject: Re: [TN] Manual spraying


> How do you dry/cure the coating? Are you sure it is being introduced
> during coating and not during drying?
>
> On Thu, Aug 20, 2009 at 11:17 AM, Inge<[log in to unmask]> wrote:
>> Good Evening,
>> we use small cans filled with 1B1 conformal coating for handspraying 
>> boards.
>> The guys are not satisfied with the result, because sometimes the result 
>> is
>> matte. Microscope photos show thousands of microscopic bubbles in the
>> coating. I suspect that it's included driving gas. Or wrong handling the
>> spray can.Anyone out there with experience? How do you avoid this 
>> problem?
>> /Inge
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