Manon, At table 4-12 the header of four column (between "Materials" and "Reference") says four time the same: "a0". I would expect four different material properties (together with their metric). Bernhard -----Ursprüngliche Nachricht----- Von: Manon Dutil [SMTP:[log in to unmask]] Gesendet am: Mittwoch, 20. Oktober 1999 17:26 An: TechNet E-Mail Forum.; Wanner Bernhard Betreff: Re: [TN] IPC-HDBK-001 Bernhard, Table 4-12 header in the IPC-HDBK-001 is "Temperature constants ai of coefficient of Thermal Expansion (ppm/3C) of some Electronic Packaging materials" If that is what you are looking for... Manon ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################