Try bonded Heat sinks or Copper Invar Copper Cored Multilayers. There has been some work on using Microvia dielelctric layers on Anodized aluminum that shows some promise. if I can help let me know Russ Smith ---------- From: Vaughan, Ralph H To: [log in to unmask] Subject: [TN] Thermallly conductive PWB materials Date: Wednesday, July 01, 1998 2:41PM Dear PWB fab guys, Can you provide any news, good or bad, on material used in boards to help move heat away from hot parts? We have tried the standard methods of leaving unused copper in the board rather than etching it away, and using thermal pads under the parts, but my designers think they need more thermal conduction through the pwb. If anyone has any experience with the thermally conductive pre-pregs, or any other similar material, I would appreciate your thoughts. thanks Ralph Vaughan Boeing-Atlanta ################################################################ 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 ################################################################ ################################################################ 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 ################################################################