PET silver plated film | When the "universal substrate" meets the optimal conductive metal - the "silver engine" of flexible electronics and electromagnetic shielding

1、 PET: Where does the confidence of "universal substrate" come from

PET (polyethylene terephthalate) is one of the most widely used flexible substrates. Its advantages can be summarized in three words: light, tough, and economical.

The density of PET is about 1.38g/cm ³, much lower than that of metal foil materials, and it has significant lightweight advantages in scenarios that require large-scale applications. Its tensile strength can reach over 200MPa, and it can withstand a certain degree of tension and bending without breaking. PET can be used for a long time at around 120 ℃ and can withstand high temperatures of up to 150 ℃ in a short period of time, making it suitable for electronic manufacturing processes such as reflow soldering. PET has good resistance to common organic solvents such as ethanol and acetone, and is still reliable in complex chemical environments. More importantly, PET is a bulk chemical raw material with a much lower cost than special engineering plastics such as PI, making PET silver plated film have significant economic advantages in large-scale applications.

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). Another advantage of silver is its reflectivity - it can reach over 95% in the visible light range and over 99% in the near-infrared range. High reflectivity means that energy loss can be minimized to the greatest extent possible in optical systems.

But silver also has a weakness: it is prone to oxidation in air. Advanced Institute Technology effectively delays the oxidation of the silver layer through optimized silver plating process and protective layer design, ensuring stable conductivity and reflection performance of the material during long-term use.

3、 Core performance data of PET silver plated film

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

Conductivity is the most crucial indicator. Advanced Institute Technology's 25 μ m PET silver plated film has a surface resistance as low as 0.01 Ω/□ or below. In flexible display applications, PET silver plated film can transmit 0.5A current at 5V voltage, which is equivalent to the performance of traditional ITO conductive lines. Before and after immersion in simulated body fluids, the conductivity of the silver plated PET electrode remained stable at around 0.03 Ω/□, and the adhesion exceeded 40N/cm.

The electromagnetic shielding effectiveness determines how much electromagnetic waves a material can 'block'. In the frequency range of 1GHz-10GHz, the shielding effectiveness of PET silver plated film can reach over 60dB. In the low frequency range of 10kHz-100MHz, it can reach 20-40dB, and in the high frequency range of 100MHz-1GHz, it can even reach 40-60dB or even higher. A 40nm ultra-thin silver layer can achieve a shielding efficiency of 49.89dB. 60dB means that 99.9% of electromagnetic waves are effectively blocked - enough to meet EMC standards for consumer electronics and industrial equipment.

The reflection performance is equally excellent. The PET silver plated film of Advanced Institute Technology has an average reflectivity of over 97.5% in the visible to near-infrared range. Some products even have a reflectivity of over 98%. In the near-infrared band, the reflectivity can reach as high as 99.45%.

4、 Three major application battlefields: from flexible circuits to 5G communication

Flexible electronics and consumer electronics are the fields with the highest usage of PET silver plated film. In flexible circuit boards (FPCs), PET silver plated film can be used as a conductive line. Compared with traditional copper foil circuits, PET silver plated film has better flexibility and is more suitable for use in electronic devices that require frequent bending or folding. In touch screen applications, PET silver plated film effectively avoids the problem of decreased transmittance caused by excessive silver layer while ensuring high conductivity. PET silver plated film is widely used in the internal structure of devices such as mobile phones, laptops, and tablets to shield electromagnetic interference generated by electronic components. In flexible displays, PET silver plated film not only provides a stable current transmission path, but also enhances screen brightness through high reflectivity.

Electromagnetic shielding and industrial automation are the most demanding application directions for PET silver plating film technology. In industrial automation control systems, equipment such as motors, frequency converters, and switching power supplies generate a large amount of electromagnetic radiation. PET silver plated film can be used to wrap or cover sensors, actuators, and communication lines, effectively shielding external electromagnetic radiation. In computer rooms, communication base stations, and other places, PET silver plated film can be used to make shielding covers or curtains, effectively reducing the impact of electromagnetic radiation on the surrounding environment and equipment. The lightweight characteristics of PET silver plated film will not increase the burden on equipment, and its good flexibility makes it easy to wrap various shapes of equipment and circuits.

Optical reflection and new energy represent the application value of PET silver plated film in the field of optics. After using PET silver plated film as the reflective film in solar collectors, the heat collection efficiency can be improved by 10% -15%. In high-end optical instruments, PET silver plated film can be used to manufacture high reflectivity mirrors, optical filters, etc. Its excellent reflective performance makes it equally important in fields such as laser equipment and optical instruments. By 2025, the global market size of metalized PET film packaging materials has reached 51.831 billion yuan, with silver plated PET film being one of the fastest-growing sub categories.

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

There are significant differences in the thickness and performance requirements of PET 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, and 125 μ m.

The 5-12.5 μ m ultra-thin specification is suitable for scenarios with extreme requirements for space and weight, such as flexible circuit wiring, micro 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, with 25 μ m being one of the most widely used specifications. The 75-125 μ m enhancement specification is suitable for scenarios that require higher mechanical strength and structural stability, such as large optical reflection systems and equipment with high outdoor weather resistance requirements.

The company has passed ISO9001 certification and its products comply with RoHS environmental requirements.

The global metalized PET film market is estimated to reach $2.5 billion in 2024 and is expected to grow to $4.8 billion by 2033. The global market for nano silver transparent conductive films has reached 1.13 billion US dollars by 2025 and is expected to grow to 1.25 billion US dollars by 2026. Driven by the popularization of flexible electronics, deployment of 5G/6G communication, upgrading of industrial automation, and expansion of new energy applications, PET silver plated film is becoming the preferred solution for more and more engineers in multi scenario applications due to its unique combination of "high conductivity, high reflectivity, lightweight, and low cost".

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