That horse-shaped you mentioned is not a concern. It is not a bubble but rather the coating is flatten. It is likely to be caused by the coated PCBA being rested on this side.The same print appear on the same part on the PCBAs. It is common across the same parts on the sample size. Thanks and Regards, ~ Wee Mei ~ _____ From: TechNet on behalf of Steve Gregory Sent: Fri 7/15/2011 9:25 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~ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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