Chapter 7 of IPC-HDBK-830, Guidelines for Design, Selection and Application of Conformal Coatings deals with compatibility of the different materials in the chain.
Have you: * Tested your bare boards at incoming for cleanliness with your OmegaMeter? * Calibrated your OmegaMeter? * Tried a different flux? * Determined what is the difference between the adhesion test that was run by the outside lab and the test that you run prior to sending it to the lab?
As Ka stated above, most of us don't have the capability to perform laboratory testing in-house. We rely on independent testing labs. Here are a few labs that would be good starting points: * Robisan Laboratory; 6502 East 21 St, Indianapolis, IN 46219; 317-353-6249 F357-1270 Susan Mansilla, Technical Director firstname.lastname@example.org * Trace Laboratories - East; 5 North Park Dr, Hunt Valley, MD 21030; 410-584-9099 F9117 email@example.com http://www.tracelabs.com * STI, 261 Palmer Road Madison, AL stielectronicsinc.com Mark McMeen * UIC, Martin K. Anselm, Ph.D., Manager, Analytical & Failure Analysis Services 607-779-5077 Anselm@uic.com