From what I can find on the 'net, in my dad's metallurgy manuals, and a
scan of my CRC the ductility of pure copper is 0.62. A piece of copper
wire which is thoroughly annealed will allow stretching of 62% before it
fails at the ductile-brittle transition. This transition point is
temperature dependent so a warmer day is better. Once you have
stretched the copper you can stretch it again as long as you anneal it
first. I did not look up the annealing temperature of copper.
Thus, for safety's sake, stretch the line to a 50% increase or less to
avoid having it part on you. Copper alloys allow for less ductility so
decrease the amount of stretching to avoid an accidental parting.
GL,
Kevin. KD5ONS
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