Hello, The application is a 'SHELLCASE' package which made of a kind of glass with CTE of a bout 4ppm. I would like to know some popular materials used in the PCB's industry which compatible regarding the CTE and conventional assembly process. Tanks In Advance. ---------------------------------------------------------------------------- --------------------------------- Tamir Ben Shoshan / \ Tel : 972-9-9597-366 Senior Technology Engineer \ / Fax : 972-9-9502-922 Engineering Department // \\ Scitex Corporation Ltd. Email : [log in to unmask] Pob 330 Herzlia, Israel WEB : www.scitex.com ---------------------------------------------------------------------------- --------------------------------- ################################################################ 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 ################################################################