Have a question on old lead refrigeration lines, maybe you guys can help me out. Not too long ago a very very old plumber called me up because he had a big basket full of old refrigerant lines. According to the old codger these lines were 50-60% tin because of the way they "crackel" when you bend them. My buddy and fellow caster doesn't believe it. I myself have no idea what these old lead lines were made of but imagine a pure lead line would be too soft for the pressures of a commercial amonia refrigerant system (I assume it was ammonia but didn't ask). Does anybody have any experience in these old lead based coolant lines? They were free to me for helping move a few heavy objects out of the garage for him, so it was a win no matter what, just curious.