HI RON FROM MY DAYS OF WORK AT KISTLER-MORSE DESIGNING LOAD CELLS I THINK YOU WOULD BE WISE TO INVESTIGATE THE USE OF A CERAMIC SUBSTRATE. FR-5 OR ANY OTHER TYPE OF COMPRESSIBLE MATERIAL WILL OVER TIME DRIFT DO TO NON ELASTIC PROPERTIES. JOHN COY PCB DESIGNER -----Original Message----- From: King, Ron [mailto:[log in to unmask]] Sent: Wednesday, April 04, 2001 9:48 AM To: [log in to unmask] Subject: [DC] Substrates I have a design engineer who wants to redesign a piezo wafer and PCB sandwich that will be compressed in order to get a force reading. We are currently using FR-5 and the substrate appears to be holding up however, we have not done a micro section. My question is: What substrate would offer the most resistance to compression in the Z axis without being too brittle? Thanks, -Ron King PCB Designer Hunter Engineering 11250 Hunter Drive Bridgeton, MO 63044 314-731-0000 x541 ---------------------------------------------------------------------------- ----- DesignerCouncil 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 DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil 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 ---------------------------------------------------------------------------- -----