HI Werner, THE PROBLEM IS : 1. The actual thickness is more than 10% less of the nominal thickness. 2. Some delamination occurs after the cooling. 3. In the section report, the diameter of land to add 0.3mm of the drill size is not enough. Is that some in other factory or just the problem of us? Best regards, Eddy Chen Dear Chuck, Thanks it is quite helpful information. Eddy Chen -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Wednesday, August 18, 1999 3:55 AM To: [log in to unmask]; [log in to unmask] Subject: Re: [TN] Flex-rigid Lamination Hi Eddy, When you say "the reliability still low", what do you mean? What is failing? The PTH barrels? The interconnects? Werner Engelmaier Engelmaier Associates, L.C. Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine Run Ormond Beach, FL 32174 USA Phone: 904-437-8747, Fax: 904-437-8737 E-mail: [log in to unmask], Website: www.engelmaier.com