Scott, you were exactly right....CTI stands for Comparative Tracking Index. It is a test done by UL on PWBs. I don't have the test protocol at hand, but I know it involves applying a voltage between conductors on board sample, and dripping a dilute ionic solution on the board until a track forms between the conductors. The longer it takes to form, the higher the CTI. Timothy Reeves ECD Circuit Board Division 13626 South Freeman Road Mulino, OR 97042 [log in to unmask] (503) 829-9108 (800) 228-8198 FAX (503) 829-5482 > ---------- > From: Scott B. Westheimer > Sent: Monday, May 8, 2000 20:58 > Subject: CTI > > I am wondering if someone can help me with this question. While reviewing > customers specification for PWB I came across the requirement for CTI > >175. Can someone tell me what CTI(notCTE) stands for and how to measure. > I believe but I am not 100% that CTI might stand for Comparative Tracking > Index. But still do not understand what the term means. > > Thanks > > Scott Westheimer > ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################