PI Silver Plated Film | When the "Golden Film" Meets the Optimal Conductive Metal - A Powerful Tool for Conductivity and Electromagnetic Shielding in Extreme Environments

1、 PI: Where does the confidence of the "golden film" come from

Polyimide is known as the "golden film" not only because of its high price, but also because it stands at the top of the performance pyramid of polymer materials.

Temperature resistance is the hardest core label of PI. PI film can be used for a long time in the extreme temperature range of -269 ℃ to 400 ℃. Whether it's extreme cold in space, high temperature in the engine compartment, or thermal shock in reflow soldering processes, PI can handle it with ease. Research has shown that PI silver plated film can maintain good electromagnetic shielding performance even after 120 hours of continuous use at -196 ℃ and 250 ℃.

The mechanical performance is equally outstanding. PI film has excellent mechanical strength and flexibility, high tensile strength, and good dimensional stability. In scenarios such as foldable phones and flexible circuit boards that require repeated bending, PI substrates can withstand hundreds of thousands of bends without failure.

Radiation resistance and chemical corrosion resistance are another major advantage of PI in the aerospace industry. PI has excellent resistance to high-energy radiation and various chemical reagents, making it an ideal substrate for extreme environments such as spacecraft and nuclear equipment.

2、 Silver: Why is it the metal with the best conductivity

Among all metal elements, silver ranks first in conductivity - with a conductivity of up to 6.3 × 10 ⁷ S/m, surpassing copper (5.96 × 10 ⁷ S/m) and gold (4.10 × 10 ⁷ S/m). This means that with the same thickness of coating, silver can provide the lowest resistance and the highest signal transmission efficiency.

In the field of electromagnetic shielding, the advantages of silver are also prominent. With its extremely high conductivity, silver coating can effectively attenuate electromagnetic waves through a dual mechanism of reflection and absorption. In the wide frequency range of 300kHz to 10GHz, the shielding efficiency of PI silver plated film can reach 80-100dB. In the 8.2-12.4GHz (X-band) range, the shielding efficiency reported in relevant research can reach as high as 112dB.

In terms of reflective performance, silver has a reflectivity of over 95% in the visible and infrared bands, making it an ideal choice for spacecraft thermal control coatings, optical mirrors, and other scenarios.

The combination of silver's conductivity advantage and PI's extreme environmental tolerance creates a functional thin film that can reliably operate in scenarios where conventional materials cannot work.

3、 Core performance data of PI silver plated film

The performance of PI silver plated film ultimately needs to be answered with data.

In terms of conductivity, the silver layer endows the material with extremely low surface resistance. The silver microfiber/PI composite film prepared by the research team of Sichuan University has a conductivity of 4.5 × 10 ⁶ S/m when the silver volume fraction is only 28%. Advanced Institute Technology adopts a composite process of vacuum coating and chemical plating, and the thickness of the silver layer can be precisely controlled in the nanometer to micrometer range, ensuring that the conductivity requirements in different application scenarios are met.

In terms of electromagnetic shielding effectiveness, PI silver plated film performs well in a wide frequency range. In the range of 300kHz to 10GHz, the shielding efficiency can reach 80-100dB. At a high temperature of 150 ℃, the shielding efficiency only decreases by 5%. After 120 hours of continuous operation at -196 ℃ and 250 ℃, the shielding effectiveness remained above 85.1dB.

In terms of bending performance, PI silver plated film performs excellently in flexible electronic applications such as foldable phones. The bending radius can be reduced to below 1mm, and the resistance change rate after repeated bending 100000 times is less than 0.5%. This data means that in scenarios such as wearable devices and foldable phones that require frequent bending, the electrical performance of PI silver plated film will hardly deteriorate due to mechanical fatigue.

In terms of high temperature resistance, the shielding effectiveness of PI silver plated film only decreases by 5% at 150 ℃, and it can still maintain good electromagnetic shielding performance at 250 ℃. This characteristic gives it an irreplaceable advantage in high-temperature scenarios such as automotive engine compartments and aerospace equipment.

4、 Three major application battlefields: from foldable screens to spacecraft

Flexible electronics and wearable devices are one of the areas with the highest usage of PI silver plated film. PI silver plated film is used as a conductive layer and electromagnetic shielding layer for flexible circuit boards in devices such as foldable smartphones, smartwatches, and flexible displays. After adopting PI silver plated film, the product weight can be reduced by about 30% and the thickness can be reduced by about 40%, while maintaining good electrical performance and mechanical durability. In flexible sensors and conductive fabrics, PI silver plated film makes the equipment thinner, more comfortable, and durable.

Aerospace and military electronics represent the application dimensions with the highest reliability requirements for PI silver plated films. The PI silver plated film has broad application prospects in aerospace and microelectronics fields due to its excellent reflectivity and conductivity of the silver layer on the surface, as well as the high strength, high modulus, and excellent heat resistance of the PI substrate itself. In spacecraft thermal control systems, PI silver plated film can be used as a thermal control coating, achieving precise temperature control through the high reflectivity of the silver layer. NASA conducted extensive research on the application of PI/silver composite films in spacecraft, space telescope shells, and other fields as early as the 1990s.

High frequency communication and electromagnetic shielding are the fastest-growing application directions for PI silver plated films. The working frequency of 5G/6G communication equipment continues to rise, which puts higher demands on the frequency response and conductivity stability of electromagnetic shielding materials. PI silver plated film maintains a shielding effectiveness of 80-100dB in the wide frequency range of 300kHz to 10GHz, making it an ideal shielding material for high-frequency equipment such as 5G base stations, RF front-end modules, antenna systems, etc. In the X-band (8.2-12.4GHz), the shielding effectiveness can reach up to 112dB.

5、 Customization: From 5 μ m to 125 μ m, match as needed

There are significant differences in the thickness and performance requirements of PI silver plated film in different application scenarios. Advanced Institute Technology provides customized services for various thickness specifications such as 5 μ m, 12.5 μ m, 25 μ m, 50 μ m, 75 μ m, 100 μ m, 125 μ m, etc., to meet the full range of requirements from ultra-thin flexible electronics to high reliability industrial equipment.

The 5-12.5 μ m ultra-thin specification is suitable for scenarios with extreme requirements for space and weight, such as foldable screen phone hinge cables, miniature sensors, wearable devices, etc. The universal specification of 25-50 μ m is suitable for mainstream electronic manufacturing scenarios such as flexible circuit boards and electromagnetic shielding films. The 75-125 μ m enhancement specification is suitable for scenarios that require higher mechanical strength and structural stability, such as aerospace cable shielding layers, industrial equipment conductive connections, etc.

The company has passed ISO9001 certification, and its products comply with GJB 773A aerospace standards and RoHS environmental requirements. It has the ability to support high-end fields such as aerospace, military, and 5G communication.

The global PI film market size has reached 1.282 billion US dollars in 2024 and is expected to grow to 2.015 billion US dollars by 2031. The global silver plated reflective film market is expected to grow from $812 million in 2025 to $1.28 billion in 2032. Driven by the popularization of flexible electronics, upgrading of aerospace equipment, and deployment of 5G/6G communication, PI silver plated film is becoming the preferred solution for more and more engineers in high demand scenarios due to its unique combination of "extreme environmental resistance, top-level conductivity, and broadband electromagnetic shielding".

Advanced Institute (Shenzhen) Technology Co., Ltd. will continue to deeply cultivate the field of PI silver plating film, providing customers with higher performance and more reliable flexible substrate metal coating solutions through precision coating technology and continuous technological innovation.