Also, if you go back to the IPC Review, October or November 2000, I did a review of bare board cleanliness provisions in IPC specifications and mil specs. I have it in PDF or you can get it from IPC. Doug Pauls Tom Newton <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 01/03/2008 10:36 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Tom Newton <[log in to unmask]> To [log in to unmask] cc Subject Re: [TN] specifying board cleanliness Phil and All: I routinely stay out of TechNet discussions. However, just to clarify what Graham correctly provided earlier on the currently accepted ionic contamination level per IPC documentation (1.56 micrograms per square cm of NaCl equivalent), it should be noted that the bare (unpopulated) PCB specification (IPC-6012) defines this same contamination value in section 3.9.1 "Cleanliness (for bare boards) Prior to Solder Resist Application". If you have further questions pertaining to bare printed boards, please examine this document, as it contains a wealth of requirement values for this product. Tom Newton IPC -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins Sent: Thursday, January 03, 2008 9:10 AM To: [log in to unmask] Subject: Re: [TN] specifying board cleanliness Happy New Year Phil! Well, "it depends"... First question is how clean do you need them to be? Depends on the application and environment. Second question is what sort of assembly process the CM is using - if "no clean" then they will be justifiably opposed to cleanliness testing. The generic callout that we most commonly see on drawings is "clean per J-STD-001 C-22" - which translates into clean the assembly, both sides, and then do an ionic contamination test with a upper limit of 1.56 micrograms / cm2 NaCl equivalent contamination. I'm not sure why J-STD-001 gives an option to only clean one side - never seen that process in use. Anyway, a starting point... regards, Graham Collins Halifax Production Engineering L-3 communications Electronic Systems (902) 873-2000 ext. 6215 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting Sent: Thursday, January 03, 2008 10:45 AM To: [log in to unmask] Subject: [TN] specifying board cleanliness Good Morning and Happy New Year to All, Let me start by confessing my ignorance relative to cleanliness of circuit boards. We have no idea what numbers to specify that fit into the IPC testing methods for board cleanliness. If I tell my CMs to make the boards clean, it would be good to specify a target value and or test method. Can someone give me some guidance on how to chose these specifications? What are worth while tests and which ones are window dressing? I've read through some of the IPC tests methods and my head hurts. Thanks in advance, Phil Nutting Note: All the information contained in this e-mail and its attachments is proprietary to Kaiser Systems, Inc. and it may not be reproduced without the prior written permission of sender. If you have received this email in error, please immediately return it to sender and delete the copy you received. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------