Hello,
Any other opinions on the bubbles in the attached picture? Is it a
straight rejects?
Regards,
~wee mei~
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, July 15, 2011 9:26 PM
To: [log in to unmask]
Subject: [TN] FW: [TN] IPC-A-610 Conformal Coating - Coverage
Hi Wee Mei,
I have your picture posted here:
http://stevezeva.homestead.com/Wee_Coating.jpg
I would say that the trapped bubbles between the leads are a defect.
What
type of coating is it, acrylic or urethane?
Also I notice what looks like a very large horseshoe shaped bubble on
top of
the 8-leaded part in the upper right, aren't you worried about that?
Steve
-----Original Message-----
From: Lum Wee Mei [mailto:[log in to unmask]]
Sent: Friday, July 15, 2011 1:26 AM
To: Steve Gregory
Subject: RE: [TN] IPC-A-610 Conformal Coating - Coverage
Steve,
Kindly upload my attachment for decision.
Thanks,
~wee mei~
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, July 14, 2011 10:42 PM
To: Lum Wee Mei
Subject: RE: [TN] IPC-A-610 Conformal Coating - Coverage
Hi Wee Mei,
If you want to send your image to me, I'll post it...
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Thursday, July 14, 2011 10:29 AM
To: [log in to unmask]
Subject: Re: [TN] IPC-A-610 Conformal Coating - Coverage
Is that the image from NASA workmanship criteria acceptance for
conformal
coating? I am very curious to know why are bubbles not allow between the
leads? How did the 0.76mm diameter come about?
I will try to upload my image for further decision.
Thanks and Regards,
~ Wee Mei ~
_____
From: TechNet on behalf of Steve Gregory
Sent: Thu 7/14/2011 9:02 PM
To: [log in to unmask]
Subject: Re: [TN] IPC-A-610 Conformal Coating - Coverage
Hi Jim,
Here ya' go:
http://stevezeva.homestead.com/Conformal_Coat.jpg
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James - ES
Sent: Thursday, July 14, 2011 8:27 AM
To: [log in to unmask]
Subject: Re: [TN] IPC-A-610 Conformal Coating - Coverage
I know. I sent a copy to Steve Gregory to post.
Jim Marsico
ITT Corporation
1500 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Thursday, July 14, 2011 8:26 AM
To: [log in to unmask]; Marsico, James - ES
Cc: [log in to unmask]
Subject: RE: IPC-A-610 Conformal Coating - Coverage
Jim,
The provided URL address did not display an image.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James - ES
Sent: Thursday, July 14, 2011 6:27 AM
To: [log in to unmask]
Subject: Re: [TN] IPC-A-610 Conformal Coating - Coverage
In my humble opinion, your interpretation is correct, that is, no voids
are
allowed that bridge component leads. The criteria below is what we use
in
our internal conformal coating document. If you can't see the criteria
below please let me know and I can forward it to you directly.
[cid:[log in to unmask]]
Jim Marsico
ITT Corporation
1500 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Thursday, July 14, 2011 3:34 AM
To: [log in to unmask]
Subject: [TN] IPC-A-610 Conformal Coating - Coverage
Dear All,
Can some kind souls help me to interpret the below statement taken out
from IPC-A-610 Section 10.5.2.2 Conformal Coating - Coverage? I am look
at Class 3 and I am loss on its interpretation, especially 'Voids or
bubbles'.
Acceptable - Class 1, 2, 3
No bridging of adjacent lands or conductive surfaces from :
* Loss of adhesion (mealing)
* Voids or bubbles
* Dewetting
* Cracks
* Ripples
* Fisheyes or orange peel
It is common to find bubbles trapped between the soldered leads of those
gull-leaded components and between closely mounted SMDs passives for
brushing method. Are these bubbles allow for Class 3?
Thanks and regards,
~wee mei~
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