Look at the QPL for MIL-C-46058. This won't give you performance results, but it will tell you which coatings have passed the performance requirements sections of the specification. Part of 46058 requires humidity exposure testing per MIL STD 810. I believe this testing is done with the power off. As far as powered-up, high moisture environmental test results, I suspect that you would need to test your specific design for performance. Lyn R. Lynch Coates ASI [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Unidentified subject! Author: [log in to unmask] at internet Date: 5/9/96 10:11 AM Are there any resources where I could find data regarding the performance of PWBs in humid or tropical environments? Specifically are there any industry studies that assess PWB performance in humid environments, or are there any guidelines or standards that address the PWBs, environment, and the use of Humiseal or conformal coating. Thank You. Joe Pudlo Charles Industries Ltd. [log in to unmask]