If your customer is asking for solder resistance then DuPont Pyralux is rated for 550F. If they're looking for continuous operating temperature than you're limited to 105C. By the way, the Kapton dielectric film has far greater temperature stability than the Pyralux acrylic adhesive. Unfortunately, the weakest component typically controls the rated performance. Be careful of the details involved with the end use application. Pyralux goes through some pretty significant changes in Modulus during thermal aging and if the application is counting on a particular stiffness to work right they'll be disappointed over time. This reared it's ugly head in a printer application a few years ago, and the answer was to switch to more thermally stable materials. (Non-acrylic adhesive and Upilex film) Andy Magee Flex Guru - Consulting [log in to unmask] (937) 435-3629 Customer is asking for flex materials that have temperature rating of 300F-550F. Does Dupont Pyrallux Kapton go that high? Thanks. Teik M. Ng New Project Engineering Kalex Circuit Board (Guangzhou) Ltd. ################################################################ 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 ################################################################