<div class="htmlview paragraph">This paper is tutorial in nature, based mainly on the author’s own experience in electromagnetic interference control. Suggestions are offered for overcoming the effects of extreme environments as they influence interference control techniques. The techniques explained pertain to gasketing, connectors, shielding braid, shielding materials, and filters.</div> <div class="htmlview paragraph">The development of a high temperature feed-thru capacitor with solid impregnation capable of withstanding temperatures to 400 F and the environmental conditions of specification MIL-E-5009B is explained.</div>