July 17, 2008



J-STD-001D, paragraph 8.3.6 requires that, if cleanliness testing is 

mandated, the testing must be performed after final cleaning (i.e., prior to 

conformal coating).  We have an OEM who performs cleaning within 1/2 hour 

after wave soldering.  The OEM also does post hand soldering after wave 

soldering and does local cleaning of the hand soldered joints in max 1/2 

hour after soldering.  However, several days or weeks may pass between the 

wave soldering and hand soldering operations before conformal coating is 

done.  The OEM does the cleanliness test just prior to conformal coating as 

is mandated by J-STD-001 since the cleaning after hand soldering is the 

"final cleaning operation".



My question is since the cleanliness test is not done until several weeks 

after wave soldering/post wave soldering cleaning was done, will the ionic 

cleanliness testing mandated by J-STD-001 (standard instrument test like 

Omegameter) be caple of detecting ionic contamination?



Seems to me that if the cleaning process is having problems, harmful Type M 

or H flux residue, if not completely removed by the cleaning process, may 

solidify to the extent that the DI water/Alcohol cleanliness test may not be 

capable of dissolving the hardened residue precluding detecting ionic 

contamination.  Is this a valid concern or not?  Is there any data that 

shows the ability of the test equipment to detect ionic residue over time 

since cleaning?  Do we need to make any changes to J-STD-001, paragraph 

8.3.6 based on my question? If so, please propose recommended wording for 

the change.  Thanks for your support.



---------------------------------------------------

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

-----------------------------------------------------