In smartphones and smartwatches, the main task of FPC is to transmit signals - with thin line width, low current, and limited bending frequency. But the emergence of new energy vehicles and industrial equipment is redefining the engineering boundaries of FPC.

The FPC in the power battery management system (BMS) needs to carry several amperes of current; The FPC in the engine compartment needs to withstand high temperatures above 125 ° C; FPC in aerospace vehicles needs to maintain dimensional stability during temperature cycling from -269 ° C to 260 ° C. These scenarios have already exceeded the requirements for FPC to be able to bend - they require FPC to be able to handle high currents, withstand high temperatures, withstand vibrations, and last for ten years.

2、 50-125 μ m: Engineering logic for thick substrates

In the thickness spectrum of FPC substrates, different thicknesses correspond to different engineering positions. 12.5 μ m and 25 μ m are 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、 Vacuum Sputtering Copper Plating: Technological Advantages of Thick Substrate

The copper layer preparation of 50-125 μ m PI copper plated film adopts roll to roll (R2R) vacuum magnetron sputtering process. In a highly clean vacuum environment, inert gas ions are accelerated by a high-voltage electric field to bombard high-purity oxygen free copper targets, causing copper atoms to uniformly deposit on the surface of PI thin films, forming a controllable thickness metal copper layer.

Advanced Institute of Technology:Build a complete customized system for flexible electronic materials, with a copper layer thickness of 0.5-50 μ m and a width of 0.5-500mm, supporting continuous roll to roll production.

4、 Copper layer thickness: performance range from 10 μ m to 25 μ m

Based on 50-125 μ m PI substrate, copper plated film products with different copper layer thicknesses can be prepared by precise control of sputtering process parameters. The thickness of the copper layer varies from 10 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.

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

6、 Application Layout: From Power Batteries to Aerospace

7、 Conclusion

The essence of 50-125 μ m PI copper plated film is an engineering trade-off between the thinning and high reliability of FPC. It does not pursue "extreme thinness", but rather "strong enough" - exchanging thicker PI substrates for higher current carrying capacity, better dimensional stability, and stronger environmental resistance. In engineering scenarios that require FPC to carry high currents, withstand extreme temperatures, or serve in harsh environments, 50-125 μ m provides reliability guarantees that are difficult to replace with 12.5 μ m and 25 μ m.

From power battery BMS to satellite payloads, from car engine compartments to industrial control cabinets -50-125 μ m PI copper plated film is pushing the application boundary of FPC from "consumer electronics" to "industry and aerospace". On this thickness platform, customizing products with different current carrying capacities by adjusting the thickness of the copper layer (from 10 μ m to 25 μ m) is a key step in transforming "thick substrates" into specific engineering solutions.