In the selection of flexible conductive materials, engineers often first focus on the conductivity of the copper layer - the square resistance and current carrying capacity. But a variable that is easily underestimated is the thickness of the substrate itself.

In applications that require carrying large currents, withstanding mechanical stresses, or undergoing high-temperature processes, the thickness of the substrate directly determines the material's dimensional stability, bending life, and processing yield. PET substrates with a thickness of 50-125 μ m have significant advantages in terms of tensile, tear, and thermal shrinkage resistance compared to ultra-thin substrates with a thickness of 6 μ m or 12 μ m. It is not pursuing 'extreme thinness', but pursuing' sufficient strength '- exchanging thicker PET substrates for higher reliability.

2、 Engineering value of 50-125 μ m thick substrate

In the thickness spectrum of PET copper plated film, different thicknesses correspond to different engineering positions. 6-12 μ m is aimed at consumer electronics and portable devices, pursuing ultimate thinness and lightness; 50-125 μ m is positioned for industrial grade high reliability applications.

3、 From PET to Copper Plated Film: The Technical Path of Roll to Roll Process

The copper layer preparation of PET copper plated film adopts a dry wet combination process of "magnetron sputtering as the base layer and electroplating for thickening". Magnetron sputtering first deposits an extremely thin copper seed layer (usually at the nanoscale) on the surface of PET, providing a highly adhesive conductive substrate; Subsequently, the copper layer is thickened to the target value through pulse electroplating process. For copper layer thickness requirements of 5-25 μ m, electroplating thickening is a necessary process step.

Copper plating is performed on a thick substrate of 50-125 μ m, with a relatively wide process window. Compared with ultra-thin substrates of 6 μ m or 4 μ m, thick substrates have a larger thermal capacity and higher mechanical strength. They have better tolerance for temperature and tension fluctuations during sputtering and electroplating processes, making it easier to ensure the uniformity and adhesion of the copper layer. The bonding strength of the PET copper plated film from Advanced Institute Technology meets the 5B standard (ASTM D3359 highest grade), and the peel strength is ≥ 8N/cm. The thickness of the copper layer can be customized according to customer needs, with a common range of 500nm to 25 μ m.

4、 Copper layer thickness: Performance range from 5 μ m to 25 μ m

Based on 50-125 μ m PET substrate, copper plated film products with different copper layer thicknesses can be prepared by precise control of electroplating thickening process. The thickness of the copper layer varies from 5 μ m to 25 μ m, and different thicknesses correspond to different performance focuses:

Note: The thickness of the copper layer is the nominal reference value, and the specific performance is subject to the actual product specifications. Advanced Institute Technology's copper layer thickness can cover 0.1-8 μ m, supporting customization for ultra-thin and thickened requirements.

5、 Key performance: Technical foundation for thick substrate and thick copper layer

Pinhole density ≤ 0.1 per square meter.

6、 Core application scenarios: from power batteries to high current FPC

7、 Selection considerations: from copper layer thickness to application scenarios

8、 Conclusion

The essence of 50-125 μ m PET copper plated film is to strike an engineering balance between the thinning and structural strength of PET substrate. It does not pursue "extreme thinness", but rather "sufficient strength" - exchanging thicker PET substrates for higher mechanical strength, better dimensional stability, and stronger current carrying capacity. In engineering scenarios where FPC is required to carry high currents, withstand mechanical stress, or undergo high-temperature processes, 50-125 μ m provides a reliable guarantee that thin substrates cannot replace.

On this thickness platform, customizing products with different current carrying capacities by adjusting the thickness of the copper layer (from 5 μ m to 25 μ m) is a key step in transforming "thick substrates" into specific engineering solutions. From composite current collectors for power batteries to high current FPCs, from electromagnetic shielding to heat dissipation management -50-125 μ m PET copper plated film is transforming the engineering choice of "thicker" into a reliable material option in high reliability application scenarios.