sit and reach a handling cure ....any idea about the time for that
Inge
----- Original Message -----
From: "Temkin, Gregg" <[log in to unmask]>
To: "'TechNet E-Mail Forum'" <[log in to unmask]>; "'Inge'"
<[log in to unmask]>
Sent: Thursday, August 20, 2009 8:52 PM
Subject: RE: [TN] Manual spraying
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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