type

moderately resistantCopper foil for lithium batteries

testing instrument

copper thickness

4µm

4.5µm

5µm

6µm

7µm

8µm

9µm

12µm

15µm

18µm

20µm

Mass per unitg/m²

35-38

39-42

43-46

50-55

60-65

70-75

85-90

100-105

128-133

155-160

175-180

electronic balance

tensile strength（kg/mm²)

≥40

≥40

≥40

≥40

≥40

≥40

≥40

≥40

≥40

≥40

≥40

Tensile testing machine

Elongation rate（%）

≥2.0

≥2.0

≥2.5

≥3.0

≥3.0

≥4.0

≥4.0

≥5.0

≥6.0

≥8.0

≥8.0

Tensile testing machine

Mechanical thickness（µm）

0,+1

0,+2

0, +3

micrometer

Surface roughness

（µm）

Smooth surface

Rz≤3.0  ( perhapsRa≤0.3,firstRz)

Roughness tester

matte side

Rz≤3.0

Roughness tester

Wettability

≥36dyne

dyne pen

oxidize resistance

140±2℃ /15min No visible discoloration or oxidation after baking

Constant temperature baking

chemical composition（%): Cu≥ 99.8% (Cu+Ag)

Wide tolerance（MM) ：± 1MM

tape measure