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Name:     Isaak Baber
Company:    Oceana Sensor Technologies
E-Mail:    FLG8RZ.aol.com

Comments:

 We are currently soldering a cap to a cylinder and are creating a closed space. We have tried several solder pastes and wires (43Pb 43Sn 14Bi) with a no-clean flux included. These solders came from a variety of companies including Alpha Metals, Indium Corp., AIM, and ESP.
We found that when the no-clean flux is trapped in a closed space the surface insulation resistance at a temperature of 250 deg F drops by several orders of magnitude. We believe this is due to volitile organic content contained in the flux. We have found that by placing a small hole in the wall of our closed space (which acts like a vent) prevents the surface insulation resistance from dropping and we maintain the same insulation resistance that we have at room temp. However, making a hole is not a realistic solution for us, since the device we are making must be hermetically sealed.
Do you know of any type of no-clean flux that can maintain high insulation resistance at high temperatures in an enclosed space. (250 deg F)
Do you have any experience dealing with soldering practices in enclosed spaces? We would appreciate any suggestions or help that you may be able to supply us with. You can contact me. Dr. Isaak Baber at 757-426-3678.


Thank you very much,
Dr. Isaak Baber



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