Olivia No clean fluxes leave residues. J-STD-001B (can't quote issue C because I don't have a copy to hand) states: 8.3.5 Flux Residues Assemblies shall be tested in accordance with IPC-TM-650, Test Method 2.3.27 and shall comply with the following requirements for the maximum allowable level of flux residues: Class 1 assemblies less than 200 microgram's/sq cm Class 2 assemblies less than 100 microgram's/sq cm Class 3 assemblies less than 40 sq/sq cm In case you don't know the classifications Class 3 is safety critical products - e.g. gas meters, military hardware, ABS, air bag or engine management stuff etc.. Class 2 is service dependant products - UPS systems, process plant control and stuff that doesn't necessarily endanger life but matters if it breaks! Class 1 is low consequence product - PC's, phones, toys etc.. As to the failures you mention, flux residues + moisture + electricity = trouble. Hope this helps. Regards Graham Naisbitt [log in to unmask] <mailto:[log in to unmask]> Concoat Limited Alasan House, Albany Park Camberley GU16 7PH - UK www.concoat.co.uk <http://www.concoat.co.uk> Phone: +44 1276 691100 Fax: +44 1276 691227 Mobile: +44 79 6858 2121 > -----Original Message----- > From: TechNet [mailto:[log in to unmask]]On Behalf Of Olivia Mc Dermott > Sent: 30 January 2002 13:48 > To: [log in to unmask] > Subject: [TN] Flux residue with a no-clean process > > > Is it OK to have flux residue on assemblies when the process is > no clean. We > have assemblies that are failing in the field and the customer thinks this > flux residue may be an issue. They think the assembly has been wet. > What do you think???? All help appreciated. > > _________________________________________________________________ > Join the world’s largest e-mail service with MSN Hotmail. > http://www.hotmail.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 e-mail to > [log in to unmask]: SET Technet NOMAIL > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > 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 e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest 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 ---------------------------------------------------------------------------------