Mark: The maximum service temperature for unfilled optically clear epoxy is about 180 C. It "may" survive short exposures in the reflow oven of the 250 C range without yellowing or breaking down but you're pushing it. You may want to consider a clear silicone system which has better high temperature resistance. As far as moisture absorption most high temp unfilled epoxies should be less than 0.5% B.W. Is this good enough to meet your requirement? The issue of air bubbles is up to you to control. This will probably require a vacuum de-airing step of the material prior to encapsulation and possibly another one after, prior to cure. Contact: Grace Speciality Polymers; Atlanta GA. 404-696-4565 MasterBond Inc. Hackensack N.J. 201-343-8983 TRA-CON Inc. Medford MA. 617-381-5550 Regards Michael Barmuta Staff Engineer Fluke Corp. Everett Wa. 425-356-6076 On Tue, 11 Aug 1998 13:20:04 -0700 Mark [log in to unmask] wrote: > From: Mark [log in to unmask]> Date: Tue, 11 Aug 1998 13:20:04 -0700 > Subject: [TN] Optically transparent epoxy > To: [log in to unmask] > > Technetters, > > I am looking for an optically transparent epoxies for use as a potting > compound that can withstand IR reflow. This epoxy must be very stable and not > absorb moisture. Also air bubble must be kept to a minimum. Recommendation > on manufacturers, suppliers, or specific products would be much appreciated. > Also any information on reliability of these products would be also help. > > Thanks for your help, > > J. Mark Elliott > Maxtek Components Corp. > 503.627.3641 > [log in to unmask] > > ################################################################ > 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 > ################################################################ > ################################################################ 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 ################################################################