Thank you Bob, I have tried to tell the guys to make interfaces better so we can get rid of gaskets, but at Ku extremly small burrs and voids will cause uwave leakage and reflections, and make some fraction of a dB in reading. So, we use Si'rings also, but the gasket I talk about is for making the MECHANICAL interface better, i.e. a perfect ID-to-ID, resulting in less reflections. An ordinary surveillance radar with lots of power is of course not that critical. You can afford loosing one or two Watts here and there. Again, thanks for advice. Ingemar Hernefjord Ericsson Microwave Systems It is not too unusual of a question. We use a lot of C and Ku band waveguide. Most of our assemblies fit nice and tight and we have been able to eliminate conductive gaskets and use cheap silicone rings to keep out the moisture. The one situation I know we have to use conductive gaskets is for a WRD580 flange. We buy the gasket from a company called Microwave Resources, our cost is under $10. Another is SAS Industries. Microwave Resources Bob Garvey 770-441-9193 SAS Industries Steve Steckis 516-727-1441 Good luck. Jay Bosserman MCL Inc. Hi, an unusual question, but I see many radar guys are reading also in TechNet. So, what sealing gaskets do you use for flange-to-flange sealing, electrically as well as gas tightening? We tried Indium, works well, but the price is immense. If the waveguide is ordinary Al with Nickel+Chromate, then what about Tin gaskets? Atmosphere around is dry and you have that Nickel barrier. Copper seems to be too hard. Any good idea? Ingemar Hernefjord Ericsson Microwave Systems ############################################################## 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 ##############################################################