Hi Gang, At my previous employer, using a peelable latex mask on the contacts was our preferred fix along with a visual inspection under UV light. We also tried water soluble masks but, there were concerns over loading up the aqueous cleaner. Hans ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hans M. Hinners Process Engineer Toppan Electronics, Inc. 770 Miramar Road San Diego, CA 92126 (858) 695 - 2222 ext. 241 (858) 695 - 6823 fax [log in to unmask] -----Original Message----- From: Crepeau, Phil [mailto:[log in to unmask]] Sent: Thursday, May 10, 2001 9:38 AM To: [log in to unmask] Subject: Re: [TN] Conformal Coating Wicking hi, can't you use a temporary latex maskant to prevent this wicking? phil -----Original Message----- From: Paul Bannister [mailto:[log in to unmask]] Sent: Thursday, May 10, 2001 9:00 AM To: [log in to unmask] Subject: [TN] Conformal Coating Wicking I am having a problem with conformal coating wicking into connectors on a PCB and would like TechNet's advice. We spray a mixture of 1 part IB31-EPA Humiseal with 1.6 parts Humiseal thinner 600 from a Nordson automated coater and than cure the boards in a NC-100 Select Cure oven. The connector with the problem is a Samtec BCS series pass through connector. If any amount of the conformal coat mix comes into contact with the pins of the connector on the topside of the PCB the material is wicked up inside the connector. The outside of the connector pin is than "glued" to the inside of the connector housing causing contact problems at low temperature (-40C). Does anyone have suggestions on how to prevent the wicking while still covering the solder joint on the connector. Samtec does not offer a sealed connector in this series because of the pass through feature. Thank you. ########################################### This message has been scanned by F-Secure Anti-Virus for Microsoft Exchange. For more information, connect to http://www.F-Secure.com/ ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------