What is EMI/EMC Resistant Material?

With the rapid development of science and technology and the electronics industry, a variety of digitalized, high-frequency electronic and electrical equipment in the work of a large number of different wavelengths of electromagnetic waves radiated into space at different frequencies, which led to new environmental pollution - electromagnetic interference (Electromagnetic Interference ,EMI) and radio frequency or radio interference (Radio). Frequency Interference (RFI).

What is EMI?

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.

Features and application areas:

Good electrical conductivity and shielding effect, good thermal conductivity, good ductility, easy to extrusion processing, good corrosion resistance, weather resistance, 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 display, 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, the inner package of highly compressed and highly elastic foam core, after precision processing and composition. Conductive cloth liner has a good electromagnetic wave shielding effect. Can be processed according to customer requirements in a variety of different shapes and sizes, widely used in a variety of electronic products EMI shielding materials / EMC prevention and control.

Applications:

Conductive cloth liner is suitable for electromagnetic shielding, anti-static (ESD) and grounding of various electronic equipment. It can be widely used in electronic chassis, enclosures, indoor chassis, industrial design, laptop computers, mobile communication devices and so on.

Conductive rubber (rubber strip):

Conductive rubber is a rubber material filled with a metal filler that provides high conductivity, electromagnetic shielding, and moisture sealing. Each conductive rubber is composed of an adhesive such as silicone, silicone fluoride, EPDM or carbon fluoride-silicone 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. Standard shapes include: solid O-strips, hollow O-strips, solid D-strips, hollow D-strips, U-strips, rectangular strips, hollow rectangular strips, hollow P-strips, channel strips, as well as molded conductive rubber moldings, molded D-rings/O-rings, various flanges, and I/O gaskets.

Characteristics: In the range of 20M-20GHz can reach 90 dB-120dB, pure silver particles can even reach more than 120dB. Can play the role of shielding and environmental sealing, easy to install.

Application areas:

Conductive rubber is used in the need for long-term stability of excellent electromagnetic shielding and highly conductive parts. Widely used in communication 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 ground terminal that can be used for PCB brazing in order to avoid malfunctioning due to unwanted electromagnetic waves in electrical/electronic equipment or to reduce EMC countermeasures for EMI shielding material noise.

Application Fields:

Can be 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 machines by the external impact or drop the impact generated by the SMT chip foam has excellent shock absorption characteristics, with the protection of internal accessories buffer effect. Can be widely used in electronic chassis, chassis, indoor chassis, industrial design, laptop computers, mobile communication equipment and so on.

Conductive silicone:

1, conductive silicone is a paste material, divided into single / two-component packaging and room temperature / high temperature curing conductive silicone, the current market demand for commonly used materials are mainly silver / copper, silver / nickel, nickel / carbon and so on;

2, suitable for FIP (Form In Place) on-site molding process, used in precision dispensing machines for dispensing, can be dispensed into D-shaped, triangular, wavy shape;

3、 Outstanding shielding efficiency and mechanical efficiency;

4、 Lower viscosity shortens the dispensing cycle and improves productivity;

5, in most metal surfaces have good adhesion;

7, room temperature conductive adhesive curing time of 12 ~ 24 hours, high temperature conductive adhesive curing temperature of 150 degrees Celsius 30 minutes;

8, conductive silicone in the outdoor environment through rigorous testing to confirm the reliability and good resistance to electrolytic corrosion, more suitable for harsh outdoor environments in a long period of time in the heat, cold, humidity, UV, ozone and locking and other harsh environments to ensure that its performance is very stable;

9, Working temperature range of -55 degrees Celsius to +125 degrees Celsius.

Application areas:

Conductive silicone is mainly used in communications, electronics, military, security, automotive industry, can be widely used in wireless base stations, repeaters, filters, cell phones, PDAs, laptops, automotive central control, cameras, walkie-talkies, security equipment, such as wireless equipment chassis on the electromagnetic shielding. It has better shielding performance when used on aluminum alloy and other die-casting parts.

Conductive coating:

Anti-electromagnetic interference shielding paint, commonly known as conductive paint.

Conductive paint containing 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 a metal like absorption, conduction and attenuation of electromagnetic wave characteristics, thus playing a role in shielding electromagnetic wave interference.

Technical parameters:

Conductive effect: ≤ 0.025Ω/m² (paint film thickness of not less than 20μm)

Application of conductive parameters: 1Ω/20μm film thickness / distance 10cm

Recommended film thickness: 20-25μm

Electromagnetic wave absorbing material:

Wave-absorbing materials are generally alloy powder through a variety of processes and polymer resin mixing, calendering into a flexible sheet material, through the hysteresis loss, dielectric loss, resistance loss and other mechanisms into heat, potential energy and other forms of energy, to achieve shielding and absorption of electromagnetic wave effect.