hi, keep in mind that dielectric strength (volts/mil) is a function of thickness. by that i mean that the dielectric strength measured on a 'thin' sample will be greater than the dielectric strength measured on a thick sample. if this is an important property, you should measure the breakdown strength on the dielectric at the thickness you intend to use. phil -----Original Message----- From: Darnell, Barry (IndSys, GEFanuc, CDI) [mailto:[log in to unmask]] Sent: Thursday, September 27, 2001 6:56 AM To: [log in to unmask] Subject: [TN] Dielectric Strength Can someone tell me the dielectric strength (how many dc volts per mil, layer to layer) can FR-4 handle? Also, I need to create a capacitor between two pieces of copper on opposite sides of the board. How do I calculate the size of the copper to achieve a given capacitance. Thanks, > Barry Darnell > (864)627-8800 Ext. 217 > mailto:[log in to unmask] > Computer Dynamics, Inc. > Printed Circuit Board Designer > --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------