*mydirectindustry

Catalogs
LAIRD TECHNOLOGIES
Knitted Conductive EMI Gasket

Knitted Conductive EMI Gasket

Product catalog summary

Overview
Laird Technologies offers solutions in antenna, EMI shielding, telematics, and thermal management for industries like aerospace, automotive electronics, and telecommunications. Their approach emphasizes 'global solutions and local support' to maintain customer proximity worldwide.

Product Offerings
The document outlines various EMI gasketing products designed to control electromagnetic leakage in enclosure access doors and panels. Key products include:

ElectroNit Enviro-Seal EMI Gasketing: Strips with pressure-sensitive adhesive for easy application.
UltraFlex ElectroNit Beryllium Copper Knitted Wire Shielding: Available in configurations like hollow core round and double round.
ElectroNit Elastomer Core EMI Gasketing: Features different shapes and materials, including sponge and silicone elastomers.
ElectroGround EMI Washers and ElectroMesh Tape: Additional EMI shielding solutions.

Design Considerations
Mechanical and environmental factors are crucial in selecting the appropriate EMI gasketing. Key considerations include:

Gasket Interface Design: Optimal conditions involve flat surfaces with bolts outside the gasket area to prevent overcompression.
Joint Unevenness: Proper gasket selection is crucial to bridge gaps and maintain shielding effectiveness.
Compression Set and Closure Force: Recommendations for maintaining gasket integrity and performance.

Ordering Information
Guidelines for specifying gaskets with PSA, including part number conventions for adhesive placement. Consultation with Laird Technologies engineers is advised during the design stage for optimal gasket assembly design.

Conclusion
Laird Technologies provides a wide range of EMI gasketing solutions tailored to meet specific electrical, mechanical, and environmental requirements, ensuring effective EMI shielding across various applications.

Introduction to Gasket Materials and Environmental Considerations
Gasket materials are crucial for maintaining enclosure integrity, with performance largely determined by compression set characteristics. Most resilient gasket materials can recover most of their original height after being compressed by 25% to 30%.

Environmental Classes
Gasket materials and surface finishes are selected based on the operating or storage temperature of electronic packages, designed for five general environments:

Class A: Controlled environment with regulated temperature and humidity, typically indoors.
Class B: Uncontrolled environment with exposure to 100% humidity and occasional wetting, often outdoors or in warehouses.
Class C: Marine environment, either shipboard or near saltwater.
Class D: Space environment with high vacuum and radiation exposure.
Class E: Exposure to solvents for breaking down NBC toxic substances.

Elastomer Materials
Elastomers used with EMI gasketing materials vary based on the environmental class:

Neoprene: Suitable for Class A environments, withstands temperatures from –65°F to 212°F for solid material and –25°F to 212°F for closed cell sponge elastomer.
Silicone: Operates at temperatures from –80°F to 500°F for solid and –103°F to 401°F for closed cell sponge silicone, resistant to water and hydrocarbons.

UltraFlex® ElectroNit® Beryllium Copper Knitted Wire Shielding
This product combines the mechanical properties of beryllium copper with high shielding effectiveness, offering:

80% less compression force than conventional materials.
Over 90% recovery of original height at up to 75% deflection.
Lightweight and high cycle life.
No moisture absorption.

Available in various configurations and materials, including aluminum and stainless steel for increased compatibility.

Compression Recovery and Cycle Test Data
UltraFlex® shielding gaskets can recover 90% or more of their free height after repeated deflections. Cycle recovery data is provided for standard UltraFlex diameters.

ElectroNit® All Mesh EMI Gasketing
Designed for high attenuation, this gasketing is available in various materials and configurations, offering consistent contact and high shielding effectiveness.

Tables and Charts
The document includes detailed tables and charts on dimensions, tolerances, and material specifications for various gasket products, providing essential data for selecting the appropriate gasket for specific applications.

Product Specifications
Lists of part numbers with corresponding outer diameters (O.D.), inner diameters (I.D.), and dimensions over wire for tubing and elastomer products. The document specifies the materials used, such as BeCu neoprene sponge and silicone elastomer tubing, with suffixes indicating material variations.

Tolerances
Detailed tolerance ranges for different size categories, specifying allowable variations in width and height for both rectangular and round elastomer products. Tolerances are provided in both inches and millimeters.

Material Suffixes
Explanation of suffixes used in part numbers to denote different material compositions, such as Monel, beryllium copper, and tin-plated copper clad steel.

EMI Gasketing
Description of ELECTRONIT® elastomer core EMI gasketing, including construction types like rectangular and round with sponge or silicone elastomer. The section highlights the use of knitted wire for enhanced EMI shielding.

ElectroGround® EMI Washers
Information on washers designed for grounding and vibration dampening, with details on material options and applications. The section includes figures illustrating different washer configurations and their uses.

Critical Information

Material Options: The document emphasizes the availability of various materials to suit different environmental conditions, such as salt fog and extreme temperatures.
Application Guidance: Recommendations for selecting the appropriate gasket or washer based on specific enclosure size and mounting criteria.
Dimensional Charts: Size vs. tolerance charts are provided for different product configurations, ensuring precise application in engineering designs.

Specifications

ElectroGround EMI Washers: Dimensions are provided in Table 1, with outer diameter (O.D.), inner diameter (I.D.), and maximum thickness (T) specified. Material codes are listed in Table 2, including Beryllium Copper, Monel, Aluminum, Tin Plated Steel, and Stainless Steel. Tolerances for dimensions are detailed in Table 3.
ElectroMesh Tape: Designed for EMI shielding and grounding, this tape is flexible and conforms to irregular surfaces. It is available in various materials and supplied in 50 ft. rolls. Key features include tin plating for solderability and a knit loop structure for uniform coverage.
UltraSoft Knit EMI Gaskets: Made from metalized nylon yarn over a flame-retardant foam core, these gaskets provide effective EMI shielding. They are available in standard lengths and can be customized. Specifications include surface resistivity, compression set, and temperature range.

Procedures

How to Specify: Instructions are provided for selecting the appropriate washer dimensions and material code, with an example of determining a full part number.
How to Order: For UltraSoft Knit Gaskets, sizes are determined from a table, and custom lengths can be ordered.

Standards and Recommendations

Galvanic Corrosion: The document discusses the galvanic series and its implications for corrosion in dissimilar metal couples. It provides design recommendations to minimize corrosion, such as maximizing the anode-to-cathode surface area ratio.

Key Data

Tables provide detailed dimensions and tolerances for various products.
Material codes and their corresponding specifications are listed for easy reference.
Performance characteristics of UltraSoft Knit Gaskets are highlighted, including shielding effectiveness and compression-deflection data.

Corrosion Prevention Overview
Corrosion is influenced by the electrochemical differences between metals and the environment's corrosiveness. The document outlines strategies to minimize corrosion when using dissimilar metals.

Basic Corrosion Prevention Steps

Avoid using metals with widely different electrochemical potentials. Refer to the Metals Galvanic Compatibility Chart for guidance.
Introduce a third metal to reduce the potential difference between dissimilar metals.
Design interfaces to increase the anodic metal's surface area compared to the cathodic metal, reducing current density and corrosion.
Prevent moisture and electrolytes from entering joints through improved design or environmental seals.

Environmental Considerations

In harsh environments, metals should be no more than one level apart on the compatibility chart.
In normal environments, the potential difference should not exceed 0.25 volts (5 chart levels).
In controlled office environments, a difference of up to 0.5 volts (10 chart levels) is acceptable.

Metals Galvanic Compatibility Chart
The chart provides a list of metals and their electrochemical potential differences, aiding in selecting compatible metal pairs to minimize corrosion.

Disclaimer
The information is provided in good faith but without warranty. Users should determine suitability for their purposes and consult Laird Technologies for expert advice if needed.

Contact Information
Contact details for Laird Technologies' offices in North America, Europe, and Asia are provided for further assistance.

Catalog excerpts

Knitted Conductive EMI Gaskets > engineered antenna, emi, telematics and thermal applications size="-1">

Open the catalog to page 1

The EMI products presented in this section represent Laird Technologies ongoing commitment to provide the design engineer with a complete range ofsolutions for controlling electromagneticleakage along enclosure access doors and panels.To help the designer comply with susceptibility and emission criteria for both commercial and military specifications,this section providesboth designassistance and a comprehensive listing of products that best fit electrical,mechanical,and environmental EMI application requirements. Visual Part Reference Guide . . . . . . . . . . . . . . . . . . . . . . . . . ....

Open the catalog to page 3

UltraFlexElectroNit BeCu Knitted Wire Shielding > Hollow Core RoundHollow Core Round with Single FinHollow Core Double RoundUltraFlexDӓ Shape Pages 9-11 ElectroNitAll Mesh EMI Gasketing > Enviro-Seal Strip with Pressure-Sensitive AdhesiveDouble Shield Enviro-Seal Strip with Pressure-Sensitive AdhesiveAll Mesh Single Round with Fin StripAll Mesh Double Roundwith Fin StripAll MeshRectangular StripAll Mesh Round Strip Pages 12-14 ElectroNitElastomer Core EMI Gasketing > Rectangular with Sponge ElastomerRound with SpongeElastomerRound with Silicone ElastomerTubingSingle Fin with SpongeElastomer Single...

Open the catalog to page 4

When ordering,please call our sales department to confirm availability and lead times. > KNITTED CONDUCTIVE EMI GASKETS PART NO.PRODUCTPAGE NO. 8101-01XX-40,41,47,48,49ULTRAFLEX ELECTRONIT HOLLOW CORE ROUNDPage 10 8102-02XX-40,41,47,48,49ULTRAFLEX D ELECTRONIT WITH PSAPage 10 8103-01XX-40,41,47,48,49ULTRAFLEX ELECTRONIT HOLLOW CORE ROUND WITH SINGLE FINPage 10 8104-01XX-40,41,47,48,49ULTRAFLEX ELECTRONIT HOLLOW CORE DOUBLE ROUNDPage 10 8300-XXXX-40,42,43,44,46ELECTROMESH TAPEPage 27 8401-01XX-XXELECTRONIT ALL MESH RECTANGULAR STRIPPage 13 8402-01XX-XXELECTRONIT ALL MESH ROUND STRIPPage 13 8403-01XX-50,52,54,55,60,61ELECTRONIT...

Open the catalog to page 5

ELY USED TECHNIQUES FORMOUNTING: E > FIGURE 3A.FIGURE 3B. FIGURE 3C.FIGURE 3D. FIGURE 3E. FIGURES 3A THROUGH 3E ILLUSTRATE SEVERAL WID > Double Adhesive Tape Groove MountingIn groove mounting,gasket should have sufficient clearance to achieve optimum contact when compressed to desired tolerance. > Adhesive MountingAdhesive strip is applied only beneath the fin area, allowing the conductive knitted mesh direct contact with the host material. FIGURE 1. FIGURE 2. LOCATION OF PRESSURE-SENSITIVE ADHESIVE (PSA) ON FIN > PSA Topside ԓ8 PSA PSA Partition with Flat ContactPartition with Knife-Edge Contact...

Open the catalog to page 6

Compression Stop Enclosure CoverEMI Gasket > CoverEMI GasketEnclosure Flange Compression Stop CoverEMI Gasket Enclosure >

Open the catalog to page 7

FIGURE 7. SHIELDING EFFECTIVENESS VS. COMPRESSION FORCE Class C Marine Environment ח Shipboard exposure or land exposurewithin two miles of salt water where conditions of Class A are not met. Class D Space Environment ח Exposure to high vacuum and high radiation. Class E Nuclear,Biological,Chemical (NBC) ח Applications subject toexposure to solvents used to break down NBC toxic substances.Choice of an elastomer used in a knitted wire product for a resilient core is afunction of the class in which the specific equipment will be operated or stored.The elastomer materials listed below are commonly...

Open the catalog to page 9

Laird Technologies Part No.*WidthHeight > All dimensions shown are in inches (millimeters) unless otherwise specified. >

Open the catalog to page 11

TotalWidth PSADiameter0.100 in.(2,5 mm) max.Ends finished to prevent fraying using neutral color polyurethane acrylic on both ends SpecificLength XX All dimensions shown are in inches (millimeters) unless otherwise specified. >

Open the catalog to page 12

Tolerance Size RangeDiameter To 0.120 (3,1)+ 0.020/- 0.000 (+0,5/-0,0) >

Open the catalog to page 14

Height 0.100 in.(2,5 mm) max.Ends finished to prevent fraying Size RangeTolerance 1.0 to 4.0 (25,4 to 101,6)ѱ 0.030 (0,8) 4.0 to 8.0 (101,6 to 203,2) 0.060 (1,5) Width All dimensions shown are in inches (millimeters) unless otherwise specified. 8.0 to 12.0 (203,2 to 304,8)ѱ 0.093 (2,4)12.0 to 18.0 (304,8 to 457,2) 0.125 (3,2) Specified Length >

Open the catalog to page 15

Laird Technologies ElectroNit > ή Super Soft gasket material consist of one layerof knitted wire mesh over a flame retardent UL 94 HF-1 low density foam polyester core material.Two wires in three different diameters are available. Please refer to table Material Code on this page. Rectangular Standard Profile Material Code > B Monel > Alu Stainlesssteel Tin plated copperclad steel > PU-Foam 0.004 inchwire (0,1 mm) 8437- - 8433- 8438- > Part Number H B PU-Foam 0.002 inch wire (0,05 mm) 8439- - - - > -2207 0.126 (3,2) 0.252 (6,4) -2208 0.126 (3,2) 0.374 (9,5) Specifications > -2209 0.126 (3,2) 0.500...

Open the catalog to page 19

Three variablessize,density,and the metal or alloy of the meshחcan becontrolled to give you the optimum configuration of properties. > FIGURE 1.WITH WASHER AND JAM NUT FIGURE 2. WITH SHAFT SHOULDER FIGURE 3. WITH POSITIVE STOP CUP WASHERFIGURE 4.MOUNTED IN FLANGE GROOVE www.lairdtech.com23 >

Open the catalog to page 24

A Aα 0.025 0.0251.1BRef.CRef.DPSA Tape Centered on Extended Liner Length specified by customer A >

Open the catalog to page 30

Basic Corrosion Prevention the most cathodic metals and has an anodic index of zero.The anodic indexincreases as metals become more anodic.The arrow (on the far right hand sideof the chart) points in the direction of increasinglyanodic metals.On the right side of the chart,typical finishesavailable on metallic parts manufactured by Laird Technologiesare listed along the top.The colored bars indicate the galvaniccompatibility of these common finishes to the metals listed on the left.The color code is based on both the electrochemical differences between the metals and the finishes,and the corrosiveness...

Open the catalog to page 31

All LAIRD TECHNOLOGIES catalogs and technical brochures

Archived catalogs

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

Brand list