Knitted Wire Mesh Gasket – Durable, Soft Materials & High Shielding Effectiveness

Knitted wire mesh gasket are made of metal wire mesh or metal wire mesh over elastomer core for EMI and RFI shielding of electronic equipment.

Electronic components are generally installed in an enclosure. However, during the installation, there are holes or slots between electronic components and the enclosure, electromagnetic fields will pass through these holes or slots, causing electromagnetic leakage. As the electromagnetic interference or signals increase, these EMI signals may have a negative influence on the device and other vulnerable components in the surrounding equipment, causing various device-related problems, such as degraded performance or even permanent damage. To protect these components, proper shielding measures are required to ensure the safe operation of the system.

Knitted wire mesh gaskets are a kind of effective electromagnetic shielding material to cover these holes or slots to prevent electromagnetic signal leakage and ensure the smooth operation of electrical equipment.

Many all-metal knitted wire mesh gaskets and elastomer cored knitted wire mesh gasket
Knitted Wire Mesh Tape Detailed Information

Knitted wire mesh tapes are a kind of double-layer knitted wire mesh tape. Due to its shapes and features, it can be used for the EMI shielding, grounding and electrostatic discharge of cables and cable bunches. Standard EMI shielding tape is made of tin-plated copper clad steel (Sn/Cu/Fe) knitted wire mesh and offers good adaptability to the environment, high tensile strength and good shielding performance.

When wrapping the cable bundles, cover the main cable first and then branch cables. At least 100 mm allowance must be reserved at the beginning and the end. Conductive epoxy resin adhesive can be used for end connection, welding or banding can also be sued for end connection to ensure the knitted wire mesh bandage is evenly wrapped around the cable bunches.

Commonly used material is tin-plated copper clad steel (Sn/Cu/Fe), with a wire diameter of0.114 mm, in compliance with ASTMB–520.

Knitted Wire Mesh Tape EMI Shielding Effectiveness
Material Magnetic Field Electric Field Plane Wave
100 KHz 10 MHz 1 GHz 10 GHz
dB dB dB dB
Sn/Cu/Fe 45 60 40 30
Notes: Commonly used size is 12.7 mm × 25.4 mm.
A picture of knitted wire mesh tape
All-Metal Knitted Wire Mesh Gasket Detailed Information

All-metal knitted wire mesh gaskets are a kind of elastic metal wire mesh strips, generally used as gasket materials and offer effective BMI shielding at the seams of the electronic equipment enclosure. They are often supplied in rectangular, round, round with tail and double round shapes.

A sample of rectangular shape all-metal knitted wire mesh gasket

For casts or machining parts.

Rectangular All-Metal Knitted Wire Mesh Gasket
A sample of round shape all-metal knitted wire mesh gasket

For sheet metal enclosures

Round All-Metal Knitted Wire Mesh Gasket
A sample of round with tail shape all-metal knitted wire mesh gasket

For sheet metal enclosures

Round with Tail All-Metal Knitted Wire Mesh Gasket
A sample of double round shape all-metal knitted wire mesh gasket

For sheet metal enclosures

Double Round All-Metal Knitted Wire Mesh Gasket
All-metal knitted wire mesh gaskets in various types
Common Materials
  • Tin-plated phosphor bronze (Sn/Ph/Bz). Wire diameter: 0.114 mm, comply with ASTMB–105.
  • Tin-plated copper-clad steel (Sn/Cu/Fe). Wire diameter: 0.114 mm, comply with ASTMB–520.
  • Monel. Wire diameter: 0.114 mm, comply with QQN–281 AMS–4730.
All-Metal Knitted Wire Mesh Gasket EMI Shielding Effectiveness
Material Magnetic Field Electric Field Plane Wave
100 KHz 10 MHz 1 GHz 10 GHz
dB dB dB dB
Sn/Ph/Bz 80 130 95 95
Sn/Cu/Fe 60 125 80 80
Monel 60 125 80 80
Notes: Take 127 mm × 127 mm holes as standard size.
Elastomer Cored Knitted Wire Mesh Gasket Detailed Information

Elastomer cored knitted wire mesh gasket is a product combined knitted wire mesh with elastomer cores. The base material is covered with 2 layers of knitted wire mesh. The core material includes neoprene rubber, silicone rubber sponge and rubber tube.

It is easy to remove, relatively softer and can be used in irregular or uneven seams of the electronic enclosure.

A picture of rectangular elastomer cored double-layer knitted wire mesh gasket
Rectangular elastomer cored double-layer knitted wire mesh gasket
A picture of round elastomer cored double-layer knitted wire mesh gasket
Round elastomer cored double-layer knitted wire mesh gasket
A picture of round with tail elastomer cored double-layer knitted wire mesh gasket
Round with tail elastomer cored double-layer knitted wire mesh gasket
Elastomer cored knitted wire mesh gaskets in various shapes and sizes
Material
  • Knitted Wire Mesh
    • Tin-plated phosphor bronze (Sn/Ph/Bz). Wire diameter: 0.114 mm, comply with ASTMB–105.
    • Tin-plated copper clad steel (Sn/Cu/Fe). Wire diameter: 0.114 mm, comply with ASTMB–520.
    • Monel. Wire diameter: 0.114 mm, comply with QQN–281 AMS–4730.
  • Elastomer Core
    • Neoprene foamed rubber. Comply with MIL–R–6031, type II, grade A, ordinary, temperature ranges from -30 °C to +100 °C.
    • Silicone foamed rubber. Comply with AMS–3159, temperature ranges from -75 °C to +205 °C.
    • Solid silicone rubber. Comply with ZZ–R–765, temperature ranges from -60 °C to +260 °C.

The best EMI shielding effectiveness is achieved when the double-layer knitted wire mesh gasket is compressed to 75% of its original height. The shielding effectiveness of the single-layer knitted wire mesh gasket is reduced by 5–10 dB and the shielding effectiveness of knitted wire mesh with double-layer above will not significantly increased.

Elastomer Cored Knitted Wire Mesh Gasket EMI Shielding Effectiveness
Material Magnetic Field Electric Field Plane Wave
100 KHz 10 MHz 1 GHz 10 GHz
dB dB dB dB
Sn/Ph/Bz 80 130 95 95
Sn/Cu/Fe 60 125 80 80
Monel 60 125 80 80
Notes: Take 127 mm × 127 mm holes as standard size.
Compressed Knitted Wire Mesh Gasket Detailed Information

Compressed knitted wire mesh gasket is formed by die-compressing a certain amount of knitted wire mesh gasket that contains no joints or splices, featuring excellent EMI shielding effectiveness, adjustable density (14%–20%), good performance, low price and easy installation.

Although most common are rings, gaskets can also be produced in rectangular or special shapes with holes or mounting recesses, corner radii, and other custom features.

Compressed knitted wire mesh gaskets in different types