en 
Wechat QRcode
Hotline:0755-22277778
Tel：0755-22277778
Mobile：13826586185（Mr.Duan）
Fax：0755-22277776
E-mail：duanlian@xianjinyuan.cn
Graphite nickel plated conductive silicone rubber · Coordination of conductivity and sealing
There is a classic dilemma in the electromagnetic compatibility (EMC) design of electronic devices: there must be gaps between panels, doors and frames, and interfaces and shells in the chassis, cabinet, and cavity after assembly. These gaps may seem insignificant, but they can become the main channels for electromagnetic wave leakage.
The engineering approach to solving this problem is to fill the gaps with a material that can both seal the environment (dustproof, waterproof, moisture-proof) and conduct electricity (establish an electrical continuous path).
�� Conductive rubberIt was born for this dual need. Among numerous conductive rubber systems,Graphite nickel plated conductive silicone rubberWith its unique cost-effectiveness advantage, it has become one of the most widely used solutions.
The core technology of graphite nickel plated conductive silicone rubber lies in the filler - Nickel Coated Graphite (NCG). Understanding why the structure of "nickel coated graphite" was chosen is the key to comprehending all the properties of this material.
Lightweight, self-lubricating, layered structure reduces the overall density of composite materials, improves mixing flowability, and facilitates uniform dispersion.
Excellent conductivity, corrosion resistance, and magnetic conductivity (providing magnetic shielding). Make graphite conductive and maintain stable electrical performance in moderately corrosive environments.
Lightweight graphite core conductive anti-corrosion nickel shell, balancing low density, low cost, high conductivity and corrosion resistance. The cost-effectiveness is better than silver plating system, and the shielding efficiency is better than pure carbon system.
The conductivity of conductive silicone rubber can be explained by the Percolation Theory. When the amount of conductive filler added is low, the filler particles are isolated from each other in the insulating silicone rubber matrix, unable to form a continuous conductive path, and the material as a whole still maintains insulation. When the filler content exceeds a certain critical value (percolation threshold), the filler particles begin to contact each other, forming a three-dimensional conductive network inside the matrix, and the material resistivity drops sharply.
Typical formula (180 parts filler/100 parts silicone rubber) Comprehensive performance:
Volume resistivity 0.24 Ω· cm | Tensile strength 3.688 MPa | X-band (8.2-12.4 GHz) average shielding effectiveness 55.25 dB
Some commercial products can achieve a volume resistivity as low as 0.035 Ω· cm, a shielding efficiency of 65-100 dB, and cover the entire frequency range of 100 MHz to 10 GHz.
Fill the gaps in a compressed state to achieve environmental sealing (dustproof, waterproof, moisture-proof), while completing the dual functions of conductive connection and sealing.
Can be used for a long time from -55 ° C to 160 ° C, suitable for extreme temperature environments such as outdoor, car, and aviation.
Good chemical stability in ozone, ultraviolet, and radiation environments, nickel plated graphite enhances corrosion resistance and ensures long-term reliability.
Shore A hardness of 45-70, maintaining softness at low temperatures, easy to install and disassemble, and suitable for complex structures.
| Packing type | Volume resistivity (Ω· cm) | Shielding effectiveness (typical) | cost | Corrosion Resistance | Typical Applications |
|---|---|---|---|---|---|
| Nickel plated graphite (Ni/C) | 0.035–0.24 | 55–100 dB | low | Good | Communication equipment, automotive electronics, industrial chassis |
| Silver plated aluminum/copper (Ag/Al, Ag/Cu) | 0.004–0.01 | 100–120 dB | high | general | Military, aerospace, high-end communication |
| Carbon based materials (carbon black, graphite) | >1 | 20–40 dB | extremely low | poor | Low end consumer electronics, button touchpoints |
�� Core values:The shielding effectiveness of nickel plated graphite is comparable to that of silver plated fillers, but its volume resistivity is 20-500 times higher, significantly reducing costs. In most civilian and some military scenarios, it is the most cost-effective choice.
The EMI sealing and full frequency shielding capability of switches, routers, base stations, and repeater chassis interfaces and seams meet the requirements of broadband signal integrity.
Vehicle electronic control module, communication equipment, electronic chassis, reduce mutual interference between devices, and adapt to complex thermal environments with a wide temperature range (-55 ° C~160 ° C).
Prevent electromagnetic interference in aircraft and satellites, protect sensitive electronic components, and meet strict weight and reliability requirements for lightweight and radiation resistance.
Industrial control computers, precision testing instruments, and power instrument chassis achieve "electromagnetic water vapor" dual sealing, simplifying the assembly process.
Civilian use ≥ 60dB, military use ≥ 80-100dB. Graphite nickel plating can cover 55-100dB, and high-end requirements may require silver plating system.
Low resistivity usually requires a higher filler content, which may increase hardness. A balance needs to be struck between conductivity and flexibility.
-The standard range is 55 ° C~160 ° C, which exceeds the evaluation of other materials.
Plates, die cut/molded liners, extruded hollow strips, silicone composite bimodal strips, etc., suitable for different gap sizes.
Nickel plated graphite is suitable for moderate corrosive environments, and long-term stability needs to be evaluated for strong acids/alkalis.
The essence of graphite nickel plated conductive silicone rubber is to establish a unified material solution between the seemingly contradictory functions of "conductivity" and "sealing". It uses nickel plated graphite filler to construct a conductive network for EMI shielding, and uses a silicone rubber substrate for environmental sealing and elastic compression - the two work together to complete the entire mission of a conductive rubber gasket in the gaps of the equipment.
It is not the solution with the highest shielding efficiency or the best conductivity, but it is the "just right" choice in most engineering scenarios - performance meets requirements, cost is controllable, process is mature, and reliability has been fully verified. For EMI sealing applications that require balancing performance and cost in large-scale production, graphite nickel plated conductive silicone rubber provides an industry validated engineering path.
www.xianjinyuan.cn/products.html
© 2026 Xianjin Yuan · Nickel-Coated Graphite Conductive Silicone Technical Reference
Advanced Institute (Shenzhen) Technology Co., Ltd， © two thousand and twenty-onewww.xianjinyuan.cn. All Rights Reserved.Guangdong ICP No. 2021051947 sitemap
Español
Français
Português