In the selection process of PET copper plated film, the first question faced by engineers is often not "what performance do you want", but "how thick film do you want".

The total thickness of PET copper plated film is determined by the thickness of the PET substrate and the thickness of the copper layer. The substrate thickness ranges from 4.5 μ m to 188 μ m, covering a complete spectrum from ultra-thin packaging to industrial grade thick films. In this span, 25 μ m occupies a special position: it is not the thinnest or thickest, but it is one of the most widely used and in high demand specifications.

2、 Vacuum Copper Plating: Constructing Precision Conductive Layer on 25 μ m Substrate

The copper layer preparation of 25 μ m PET copper plated film mainly adopts roll to roll vacuum magnetron sputtering process - in a highly vacuum environment, copper atoms are sputtered out by high-energy ion bombardment of high-purity oxygen free copper target material, and uniformly deposited on the surface of PET film under the action of electromagnetic field, forming a copper conductive layer with uniform thickness and strong adhesion. The controllability of copper layer thickness reaches ± 0.1 μ m. In addition, some products can also use chemical plating technology to deposit copper on the surface of PET through chemical reactions, which can achieve uniform copper plating on substrates with complex morphologies.

Copper plating is performed on a 25 μ m substrate with a relatively wide process window. Compared with ultra-thin substrates of 6 μ m or 4 μ m, 25 μ m substrates have a larger thermal capacity and higher mechanical strength. They have better tolerance for temperature and tension fluctuations during sputtering, making it easier to ensure the uniformity and adhesion of the copper layer. This is also the process foundation for stable mass production and high quality consistency of the 25 μ m specification.

3、 Copper layer thickness: Performance range from 0.5 μ m to 3 μ m

Based on a 25 μ m PET substrate, copper plated film products with different copper layer thicknesses can be prepared by precisely controlling the sputtering process parameters. The thickness of the copper layer varies from 0.5 μ m to 3 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. The typical value of square resistance for 1 μ m copper thickness is ≤ 18m Ω/□.

4、 Key Performance: Technical confidence with 25 μ m specification

5、 Core application scenarios: from electromagnetic shielding to new energy batteries

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

7、 Conclusion

The reason why 25 μ m PET copper plated film has become the most widely used thickness specification in the industry is not because it has achieved the ultimate in a certain performance dimension, but because it has achieved the optimal balance between the mechanical strength, flexibility, processing adaptability, and cost of PET substrate. It is not as "thin to the limit" as 6 μ m, nor as "thick to redundancy" as 50 μ m - it is the "just right" choice in most application scenarios.

On this thickness platform, customizing products with different conductivity and current carrying capacity by adjusting the copper layer thickness (from 0.5 μ m to 3 μ m) is a key step in transforming the "standard thickness" into specific engineering solutions. From electromagnetic shielding to flexible circuits, from 5G antennas to new energy batteries -25 μ m PET copper plated film is positioning itself as a "universal thickness" engineering option and transforming it into a reliable material choice in diverse application scenarios.