Bridging would indicate a reduction in the minimum surface coating requirement on either end. So it you break the bubble and you still have the minimum thickness on the conductor you are OK. Jeffrey Bush BAE Systems Incorporated Electronic Systems Division IS&R - Space Products and Systems P.O. Box 868, MER24-01G43 Nashua, NH 03061-0868 Office +1 603.885.8137 Mobile +1 603.318.8056 Fax +1 603.885.5258 -----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. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------