TechNet, I am designing FR4 based components with copper wire-wound magnetic cores. I will have exposed copper on the wire after assembly. My customers will then reflow my assembly on to their boards using whatever flux they pick. Is the exposed copper a problem and gross leak check the cover or should I open mouse holes in the cover and not worry about copper corrosion and the environment? Feedback would be much appreciated. Frank ################################################################ 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 ################################################################