1. Dust free pure copper (Cu: 99.99%)

2. There is a mixture of dust and other metals, even in trace amounts, and copper is used to lower the price of copper.

3. Dust rich items, baked items, and heavily deteriorated items are significantly reduced in price as copper.

4. Copper foil (thin copper) also has something that cannot be processed.

5. Even if there is no dust (accessory) on the metal mold copper, the purity of copper is low, so it is set as "entering copper".

6. The copper plate of the roof panel (roof material) is called "embedded copper" or "embedded copper" due to the application of waterproof materials or attachments such as nails.

7. Copper milling powder is generally significantly reduced due to the presence of impurities other than copper or oil attachment (even if not mixed or with oil, it cannot be fully investigated, so this has to be done).

8. The pot (red or white) of the water heater is not only made of copper (with foreign objects), so it is not treated as mixed copper, but rather as an individual variety (recorded separately).