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Apparently you've gotta heat the fk out of those moulds to get a good pour. You'll probably need two torches for the larger one. What size is that anyway? Looks like a 100oz or 5kg.
The bigger one is just under 2kg of copper when full. The mold is tapered which makes for a nicer bar.
I've got a gas torch to pre-heat the molds. It takes a few minutes to get them to glow red, then I pour.
Very impressive. How are you sourcing your copper scrap?
Do you know the purity of these?Have some plumbers who sell clean pipe, and some electricians who supply stripped wire.
Do you know the purity of these?
What base material are the molds sitting on and are you preheating the molds outside as per position in pics?
I can't believe the prices people are bidding for copper on ebay. I just saw one: 10 bids for a 1oz bar that sold for $28; I paid less than that for my silver!!
Yer copper is a Tonnage game not a ounce of Kg bar thing, its crazy people pay that sort of cash for copper, But you are correct I see idiots on social media boasting off their over priced bars they paid a fortune for thinking it is an investment. you should sell them while there is a still a demand from people with too much money to blow on fairly useless copperbarsI'm seeing 1kg bars routinely go for $200 (or more). Those premiums are crazy when there's only about $15 worth of copper in it.
Yer copper is a Tonnage game not a ounce of Kg bar thing, its crazy people pay that sort of cash for copper, But you are correct I see idiots on social media boasting off their over priced bars they paid a fortune for thinking it is an investment. you should sell them while there is a still a demand from people with too much money to blow on fairly useless copperbars
btw the bars look great,

How many units have been bought?