Electromagnetic Shielding Materials Overview

Electromagnetic waves can interact with electronic components to produce an interference phenomenon called EMI (Electromagnetic Interference). For example, TV fluorescent screen common “snowflake”, said the signal received by the interference. Electronic equipment work, both do not want to be outside electromagnetic interference, but also do not want to radiate their own electromagnetic interference with external equipment, as well as radiation hazards to the human body, which requires electromagnetic shielding to block the path of electromagnetic wave propagation. Electromagnetic shielding of electromagnetic attenuation is mainly based on the principle of reflection and absorption of electromagnetic waves.

conductive cloth

• Fiber cloth (commonly used polyester fiber cloth) after pre-treatment with electroplated metal plating so that it has metal properties and become conductive fiber cloth. Can be divided into: nickel-plated conductive cloth, carbon conductive cloth, nickel-plated copper conductive cloth, aluminum foil fiber composite cloth. Appearance of plain and grid and other distinctions; the most basic layer of highly conductive copper, combined with the outer layer of nickel corrosion resistance; nickel/copper/nickel coated polyester fiber cloth provides excellent conductivity, shielding effectiveness and corrosion resistance to adapt to a variety of different ranges of requirements, shielding range of 100K-3GHz.Characteristics and applications: good conductivity and shielding effect, good thermal conductivity, good ductility, easy to extrusion processing, corrosion resistance, weather resistance are good, good friction resistance, friction resistance up to 5,000,000 times. It can be used for professional shielding work clothes engaged in electronic, electromagnetic and other high-radiation work, special shielding cloth for shielding room; special cloth for shielding parts in IT industry, touch screen gloves, anti-radiation curtains, and so on. Widely used in PDA handheld computers, PDP plasma displays, LCD monitors, laptops, copiers and other electronic products in need of electromagnetic shielding position.

Conductive cloth liner

• Conductive cloth liner using highly conductive and anti-corrosive conductive cloth, highly compressed and highly elastic foam core, after precision processing and composition. Conductive cloth liner has good electromagnetic wave shielding effect. Can be processed according to customer requirements of different shapes and sizes, widely used in a variety of electronic products EMI shielding materials / EMC prevention and control. Applications: Conductive fabric liner is suitable for electromagnetic shielding, anti-static (ESD) and grounding of various electronic devices. It can be widely used in electronic chassis, chassis, indoor chassis, industrial design, laptop computers, mobile communication equipment and so on.

Conductive rubber (rubber strip)

• Conductive rubber is a rubber material filled with metal fillers that provide high conductivity, electromagnetic shielding, and moisture sealing. Each type of conductive rubber is composed of an adhesive such as silicone, silicone fluoride, EPDM, or carbon-silicon-fluoride and a conductive filler such as pure silver, silver-plated copper, silver-plated aluminum, silver-plated nickel, silver-plated glass, silver-plated lead, or charcoal particles. The material can be molded in sheet, molded, extruded and film form on request. Characteristics: 90 dB-120 dB in the range of 20M-20GHz, even more than 120 dB for pure silver particles. It can play the role of shielding and environmental sealing, easy to install. Application areas: conductive rubber used in the need for long-term stability of the excellent electromagnetic shielding and highly conductive parts. Widely used in communications equipment, information technology equipment, medical equipment, industrial electronic equipment market.

STM Patch Foam

• SMT SMD foam is a grounding terminal that can be used in surface assembly technology and is one of the surface assembly components. It is a grounding terminal that can be used for PCB brazing in order to avoid malfunctioning due to unwanted electromagnetic waves or to reduce noise from EMI shielding materials as an EMC countermeasure accessory for electrical/electronic equipment. Application areas: high-speed surface assembly, and has a suitable electrical conductivity and excellent heat resistance and grounding characteristics, with excellent durability and reliability of the PCB grounding with conductive elastic terminals, when the electrical / electronic equipment by the external impact or impact generated by the fall, the SMT chip foam has excellent impact absorption characteristics, with the protection of internal accessories cushioning effect. Can be widely used in electronic chassis, chassis, indoor chassis, industrial design, laptop computers, mobile communication equipment and so on.

Conductive Paint

• Anti-electromagnetic wave interference shielding paint, commonly known as conductive paint. Conductive paint using copper, silver and other composite particles as conductive particles, with good conductive properties of a paint. Conductive paint through the spraying, brushing method, so that the completely insulated non-metallic or non-conductive surface has the characteristics of absorption, conduction and attenuation of electromagnetic waves like metal, so as to play a role in shielding electromagnetic wave interference. Technical parameters: conductive effect: ≤ 0.025 Ω / m ² (film thickness of not less than 20 μm); application of conductive parameters: 1 Ω / 20 μm film thickness / distance of 10cm; recommended film thickness: 20-25 μm
• Electromagnetic wave absorbing materials: Wave absorbing materials are generally alloy powder through various processes and polymer resin mixing, calendering into a flexible sheet material, through the hysteresis loss, dielectric loss, resistance loss and other mechanisms into thermal energy, potential energy and other forms of energy, to achieve the effect of shielding and absorption of electromagnetic waves. Application areas: wave-absorbing materials are mainly used in communications, electronics, aerospace, military, navigation, medical, environmental protection and many applications of microwave, high-frequency industrial sectors, widely used in electronic digital products, wireless charging, RFID radio frequency identification, mobile communications equipment, wireless devices, office automation equipment (personal computers, TFT LCDs, etc.), audio/video communications equipment terminals, digital switches, Flexible circuit boards, high-speed CPU chips, image processors, oscillator chips, storage chips, high-speed signal line speeds, shielded enclosures, high-speed microprocessors and so on.