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Silicone Rubber Products in Electronics

Silicone Rubber Products in Electronics

The application of silicone in electronic products is mainly sealing ring and silicone thermal pad.

Sealing Ring

Silicone sealing ring has better heat resistance than ordinary rubber, can be used almost forever in 150° without performance change, can also be used for 10000 hours in 200°, can also be used for a period of time in 350°, so, most of the silicone sealing ring, is used in some of the occasions of heat resistance. Silicone sealing ring than the general sealing ring, more excellent sealing performance, and it can be 360 degrees waterproof waterproof leakage, can be used for a long time not yellow not fading, not only that, silicone sealing ring is non-toxic tasteless. More healthy and environmentally friendly.

Silicone in Electronics

Classification of Sealing Rings

1, According to the sealing ring material classification

According to different materials to divide the type of sealing ring, the use of more nitrile rubber sealing ring. Other common materials such as silicone rubber sealing ring, fluorine rubber sealing ring, etc.

2, According to the characteristics of rubber sealing ring classification

This classification is mainly combined with the use of sealing ring conditions and materials to divide. It can be divided into high temperature rubber sealing ring, low temperature rubber sealing ring, high pressure rubber sealing ring, wear-resistant rubber sealing ring, corrosion resistant rubber sealing ring and so on.

3, According to the classification of rubber sealing ring movement form

Usually there are two types of motion, namely dynamic seal and static seal. A static seal is a seal on two static surfaces. The most widely used o-ring in the seal ring is mainly used in static seal, followed by gasket seal. In the dynamic seal, according to whether there is contact between the sealing ring and its relative moving parts can be divided into contact seal and non-contact seal. Among them, the rubber sealing ring is the contact sealing mode. Usually in the dynamic seal, the common form of rubber sealing ring has a rotating shaft lip sealing ring and reciprocating motion sealing ring.

Silicone in Electronics

Silicone Thermal Pad


Metal with good thermal conductivity includes gold (317W/M-K), silver (429W/M-K), copper (401W/M-K), and aluminum (237W/M-K). Because gold and silver cost performance is too low, so the industry known as metal thermal conductivity sheet is generally copper or aluminum.


Nonmetals are divided into thermal conductive silicone sheet, thermal conductive graphite sheet, thermal conductive phase change materials, etc.

Thermal conductive silicon sheets: fill the air gap between the heating device and the heat sink or metal base. Their flexible and elastic characteristics enable them to be used to cover uneven surfaces. Heat is transferred from the separation device or the entire PCB to the metal housing or diffusion plate, thus improving the efficiency and service life of the heating electronic components. Thermal conductivity 0.8-8W/m-K, is a thermal conductivity material widely used in modern electronics, industrial, instrumentation, military and other industries.

Thermal conductive graphite sheet: graphite sheet is a widely used thermal conductive material, with a unique grain orientation, uniform thermal conductivity along two directions, the lamellar structure can be well adapted to any surface, shielding heat source and components while improving the heat dissipation performance of electronic products. Using graphite sheet to solve the heat conduction solution, has the advantages of high heat dissipation efficiency, small space occupation, light weight, uniform heat conduction in two directions, eliminating the "hot spot" area, etc.

Thermal conductivity phase change material: high performance low melting point thermal conductivity interface material. At 45 ° C, it begins to soften and flow, filling the fine irregular gap on the contact interface between the heat sink and the integrated circuit board to achieve the purpose of reducing thermal resistance.

The industries with strict requirements on thermal conductivity mainly include LED lights, automotive electronics, power supply, PDP/LED flat panel TV, communications, household appliances and medical equipment, military facilities, aircraft, water conservancy equipment and so on.

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