been a while since I did any casting. come to find wheel weights are not made of lead anymore?
a friend who owns a garage gave me a bucket of them, but they seem too hard and are marked AL-MC on the side.
Alot of WW is now zinc. And other metals. You have to separate them. It is pretty easy to do. Just use your thermometer and take the temperature to the point where only the lead will melt and skim off all the rest. Lead melts at the lowest temperature of all the stuff I have seen so far. Tom.
Most Zinc weights are marked Zn. My last two five gallon buckets contained a lot of steel and zinc. I ended up hand sorting them. I like to separate the stick on weights anyway as they are almost pure lead. Any zinc in your melt will make it useless for casting. Like Hoghead said, keep your pot temp low and if any weights float to the top, immediately remove them, they are probably zinc.
alot of folks are posting about using a fine file during the sorting process. Zinc weights will skid across the file where lead bites right in... just a thought. a melting pot with a thermostat sounds like a good idea right about now. just turn it up enough to melt the lead and leave the zinc floaters solid enough to skim off