Hi, David. And Happy Friday, Technet! Try Durostone. Be sure to spell it correctly (not Durastone)if you look up its material properties. There are others. An expert in this is Glenn Hawkins at DMI Pallet, Inc. This guy knows more about the properties of these types of materials than their inventors do. And not only that, DMI Pallet makes the best fixtures in the world for reflow, for wave solder, for rework, for anything. Superb quality and service and the lowest price in the nation. I am unabashedly this company's biggest fan, and no, I do not own any stock in the company, and no, he is not my brother-in-law or cousin. I do not ordinarily plug a product on the technet, but this company is so good at what they do that I am making this exception. Glenn has more tricks for clamping substrates, reducing thermal shock, etc. than you would believe. Contact him at [log in to unmask] Check out their methods at http://dmipallet.com/. It is a very informative site. The Durostone products he uses have had very little warpage in thicknesses greater than about 3mm for conventional size circuit boards in conventional reflow or wave solder processes. For larger sizes I recommend at least 6mm thick to ensure no warpage. I just purchased several 70" long by 14" wide reflow fixtures to use on very long flex circuit strips with lead-free reflow at 250 deg. C. They have withstood several hundred passes through the reflow, and show no signs of warpage whatsoever. The material is available as ESD-compliant, either conductive or dissipative. Glenn does sell just the material in various thicknesses, or he will machine it for you. I have been using this company as a fixture source for more than 15 years, and I just cannot say enough good things about them. They can design a pallet or fixture in a day and send you a confirmation drawing, build it the next day, and you will have it in two days, if necessary. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel Sent: Friday, November 11, 2005 12:20 PM To: [log in to unmask] Subject: [TN] High temp material Hello all, Would anyone recommend a high-temp material that can: Be machined for various fixtures and chucks Can withstand lead-free oven profiles Be used for 100 or more thermal cycles and still maintain its form (down to 1mil tolerance) Does not absorb too much heat (compared to a metal) Thank you in advance, David _________________________________________________________________ MSN Latino: el sitio MSN para los hispanos en EE.UU. http://latino.msn.com/ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------