de WB2CPN South Central Pennsylvania 2003.04.12 Back in 1947 I was in USAF in Berlin. The few of us who were getting into ham radio would remove wiring from the ex-German aircraft or anti-aircraft guns in the salvage yard at Templehof. That wire was covered in a yellow plastic which wouldn't be burnt or deformed by our 200-watt soldering irons. What was it? 73 Clete