Thanks to everyone who commented on my question yesterday "LGX file extension". Today I have another one. For the past 10 -12 months since incorporating the IPC-4101 Specification for Base Materials for Rigid and Multilayer Printed Boards and implementing Immersion White Tin as our surface finish and looking toward using 99.3Sn/0.7Cu for our wave soldering & 95.5Sn/4.0Ag/0.5Cu or 96.5Sn/3.5Ag for our Reflow soldering I have been specifying the slash sheet 24 (Tg 150°C - 200°C) as our base laminate. The reason was to get a higher Tg material in order to withstand the higher manufacturing process temperatures (wave & reflow soldering). This is now in danger due to cost reduction programs being looked at internally. Typically in the past what we called out was a generic form of FR-4 and what we got was similar to slash sheet 21 (tg 110°C Minimum). I'm in the process of calculating just what the material cost differences from our vendors is but wanted to put this out to the other industry experts also. Now for my questions, are any of those people looking at the "Lead-Free" going through similar experiences. Was my concern for the higher temps in manufacturing realistic. Was my approach realistic. Sorry if this sounds pleading but with the changes around here I'm concerned whether my ideas hold credibility or not. Thanks in advance for any comments. Steve ############################################################## 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 ##############################################################