In a message dated 06/15/1999 11:41:04 PM US Eastern Standard Time, [log in to unmask] writes: > > I'm looking for the IPC resistive spec. for the flux left behind after the > wave solder/ IR process on the finished assembly board. I guess I wonder what you mean by resistive spec for fluxes. This is not a term used in any of the flux or assembly specifications that I know of. If you are talking about surface insulation resistance, a measure of the electrical isolation between two points on a circuit board, then you can look in J-STD-004 (fluxes) or J-STD-001 (assemblies). IPC-9201, the SIR Handbook, would be good reading material. If you are talking about the resistivity of solvent extract (ROSE), which is a chemical characterization test used to determine ionic cleanliness, then J-STD-001, section 8 is what you are looking for. I would recommend reading the corresponding section 8 in the J-STD-001 Handbook. > > I've a couples of questions for anyone to address: > 1. How to measure the resistive flux residue on the finished assembly board level? Depending on the answers to the above, if you want to measure SIR on an actual finished assembly, save your sanity and don't try unless your assembly has built in test patterns. Burn-in testing would be a better alternative. If you are talking about cleanliness testing, the applicable test methods from the IPC-TM-650 manual would be: ROSE (beaker method) - 2.3.25 ROSE (static method) 2.3.26.1 ROSE (dynamic method) 2.3.26.2 Ion Chromatography (better than ROSE) 2.3.28 High Pressure Liquid Chromatography - 2.3.27.1 Residual Rosin by UV-VIS - 2.3.27 > ( is it a common in the industry that requesting Sub-con house to measure and control them)? You would get as many different answers as you have OEMs. In general, most primes levy some form of cleanliness requirement on their subcontractors. They type of requirement and the standards to meet vary widely. J-STD-001 and IPC-A-610 are the most frequently referenced. > 2. What is the IPC recommended resistive spec. for the flux residue that left behind( referring to Non-clean process) If you are talking SIR, then J-STD-004. If you are talking cleanliness, an IPC specification specific to no-cleans does not exist. Les Hymes leads a task group on no-clean implementation, but that is as close as it gets. J-STD-001 is generic enough to encompass no cleans. Doug Pauls Technical Director CSL ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################