| product | Double sided light4.5 μ m Copper foil | Double sided light6 μ m Copper foil | Testing instruments and inspection methods |
| Mass per unit area(g/m2) | 39-42 | 52-56 | electronic balance |
| Tensile strength (kgf/m2) | ≥30.0 | ≥33 | Tensile testing machine |
| Elongation rate(%) | ≥3.0 | ≥5.0 | |
Surface roughness（ μ m) Smooth surfaceRa Rough surfaceRz | ≤0.43 | ≤0.43 | Roughness tester |
| ≤3.0 | ≤3.0 | ||
| Thickness tolerance（ μ m) | -0，+2 | -0，+2 | micrometer |
| Wettability (dyne) | ≥38 | ≥38 | dyne pen |
| oxidation resistance | Bake at 140 ± 2 ℃ for 15 minutes without oxidation or discoloration | Bake at 140 ± 2 ℃ for 15 minutes without oxidation or discoloration | Oven constant temperature baking |
| Width deviation(mm) | ±1.0 | ±1.0 | Film ruler |
| Copper purity(%) | Cu+Ag≥99.8 | Cu+Ag≥99.8 | Outsourced testing |
