In modern electronic products, the function and reliability of printed circuit boards (PCBs) are crucial as the basic components that carry all circuit components. With the advancement of science and technology, especially under the requirements of high-performance and high-density circuit design, traditional circuit board protection methods have gradually exposed their limitations. Parylene coating, as an excellent circuit board protection material, is widely used in the protection of electronic components, especially in the field of circuit board protection due to its unique physical and chemical properties.

Basic characteristics and advantages of Parylene

Parylene is a polymer material that uses vapor deposition (CVD) technology to form a thin and uniform protective film on the surface of the substrate. Its characteristics include:

● Excellent insulation performance: Parylene coating has good electrical insulation and can effectively prevent circuit boards from malfunctioning due to current leakage or short circuit during use.

● Chemical corrosion resistance: Parylene film can effectively resist the erosion of external environments such as moisture, acid, alkali, and salt spray, ensuring the long-term stability of circuit boards in harsh environments.

● Excellent temperature resistance: The coating can still maintain its stability under extreme temperature conditions and is suitable for high or low temperature environments.

● Biocompatibility and environmental friendliness: Parylene is not only harmless to the human body, but also meets a number of environmental standards and is suitable for medical electronics, consumer electronics and other fields.

Specific applications of Parylene on circuit boards

1. Improve durability and reliability: In the manufacture of modern circuit boards, especially in high-precision electronic products such as mobile phones, automotive electronics, and medical equipment, the long-term stability of circuit boards is particularly important. Parylene coatings can significantly improve the corrosion resistance and durability of circuit boards by providing an effective barrier to prevent the intrusion of external moisture, dust and pollutants into the circuit board. This is especially important for high-density electronic components (such as IC chips, connectors, etc.), avoiding performance degradation or failures caused by environmental factors.

2. Shielding of electromagnetic interference (EMI): Parylene coatings not only have physical protection functions, but also effectively reduce electromagnetic interference (EMI). In some high-frequency circuit applications, the application of parylene coatings can reduce the leakage of electromagnetic signals and improve the electromagnetic compatibility (EMC) of equipment. This is particularly important for smart hardware, wireless communication equipment, etc.

3. Improvement of high and low temperature resistance: Electronic devices in high or low temperature environments often face the problem of material aging or performance degradation. Parylene coating can effectively resist damage caused by extreme temperatures. In application scenarios that require high temperature resistance, such as aerospace and automotive electronics, Parylene coating plays an irreplaceable role.

4. Waterproof and moisture-proof: As electronic devices develop towards intelligence and multifunctionality, the problem of moisture intrusion in electronic products has become more serious. Parylene coating forms a uniform protective film on the surface of the circuit board, which can effectively prevent moisture penetration, especially in outdoor equipment, automotive electronics and other occasions. Its waterproofness can significantly extend the service life of the circuit board.

5. Enhance product appearance and reliability: The colorless and transparent characteristics of Parylene coating make it not only effectively protect the circuit board, but also do not affect the appearance of the product. For some high-end electronic products that require visual neatness or beauty (such as smart home devices, wearable devices, etc.), Parylene coating provides additional aesthetics.