4mm how many square meters is the thick copper plate?
For example, 4mm thick yellow copper plate is probably around 1400 yuan, according to the Jiashan Rongchang sliding bearing casting experience, different grades of copper alloy prices are not the same
4mm thick copper foil is about 1500 yuan a square, depending on the price of copper
The bronze coins to your point, aluminum bronze (cual9fe4, cual10fe3) this kind of copper almost to 2000 yuan a square, Rongchang Golik yellow copper is probably around 2000 yuan. The thickness is a little bit lower, and the price might be a little cheaper
