DJR, IN A PREVIOUS INCARNATION I DID DESIGNS FOR A SIMILAR ENVIROMENT. YOU DIDN'T SPECIFY WHAT KIND OF WIRE; INSULATED, STRANDED, UNINSULATED, ETC. IF IT'S AN INSULATED STYLE WIRE I WOULD RECCOMEND USING TERMINALS OR CONNECTORS TO MOUNT IT. IT SOUNDS AS IF THE HEAT APPLIED TO MELT THE SILVER SOLDER IS CAUSING A THERMAL SHOCK TO THE HOLE. MAKE SURE YOU HAVE PADS ON ALL LAYERS TO SUPPORT THE HOLE AND MAKE SURE THE ASSEMBLER DOESN'T TOUCH THE BOARD WITH THE SOLDERING IRON. IF IT'S A WIRE FOR WIRE BONDING I'M ALL OUT OF SUGGESTIONS. ROBERT BUTTERWORTH SR PWB DESIGNER ADC VIDEO SYSTEMS 11 FARFIELD BLVD WALLINGFORD, CT [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: High Temp PCB Author: [log in to unmask] at internet-mail Date: 6/21/96 8:55 PM I currently have a customer with an application requiring a 6 layer PCB that must exist in a 120 degrees C environment. They are currently using silver solder to attach wires to the PCB, and the holes are failing. Did I mention there is also a lot of vibration? Does anyone know of a successful fab stategy, i.e. PCB laminate, plating and soldercoat combination that can successfully survive these conditions? We have been considering using rivets in the holes as a parallel solution. All comments are welcome. djr