1. Copper with dust is called "entering copper".

2. Items with high levels of dust, baked goods, oil adhesion, and significant deterioration will be significantly reduced in price as "lower copper".

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

4. 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".

5. 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.

6. Copper pipes with brass on them are also treated as twisted copper.

7. "Pi" refers to the insulation material wrapped around the copper piping of air conditioners.

8. Surface degradation (black, blue, green, etc.) is also acceptable.

9. Residual materials such as springs, plastic straps, lids, and insulation materials must be removed.

10. In addition, items with high oil content, welding parts, lids, tape, soldering, aluminum foil adhesion, coating, and lamination are also discounted as "copper containing" or "lower copper".

11. Brass can be used to purchase things that weigh more than copper