Dear Sir : I work inn a high frequency PCB manufacturing company and I have the following questionns : 1/ Why is it for copper plating (acid copper plating) the lower the current, the more the throwing power ? If I start to plate copper on the PTH walls with high current density after PTH, what will happen ? 2/ Our customer always specify to have a certainn thickness innside the PTH walls for copper. Why is that so for high frequency PCB ? What happen if copper thickness is thinner than the specified thickness at high frequencies ? Thanks for your help !!!!!!! my e-mail : [log in to unmask](this is only text base, pls do not send graphics) Thamks again!!!!!!! Francis ################################################################ 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 ################################################################