Fabric-Over-Foam EMI Shielding Gaskets
Profile and Input/Output (I/O) EMI shielding gaskets are available in UL94 V0 and HB flame retardant material. Laird Technologies specializes in quick turnaround of custom shapes and sizes of EMI shielding gaskets. Profiles can be cut to specified lengths, kiss-cut release liner or mitered to form frame configurations.
Features and Benefits
- RoHS compliant
- Shielding effectiveness of >100dB across a wide spectrum of frequencies (MIL-STD 285 mod.).
- Extremely low compression forces allow for use of lighter materials.
- Low Surface Resistivity of <0.07 ohms/square provides improved conductivity (ASTM F390).
- Wide range of flame retardant gaskets available (UL recognized per UL94 V0 or UL94 HB.
- Abrasion resistant materials show virtually no degradation in shielding performance after 1,000,000 cycles (ASTM D3886).
- Service temperatures from -40 to 70° C (-40 - 158°F)
- Available with a variety of pressure sensitive adhesive (PSA) tapes.
Applications
- Shielding or grounding of computer and telecommunication equipment seams and apertures
- Hand-held devices such as PDAs and mobile phones
- Digital cameras
- Set top boxes
- Liquid crystal displays (LCDs)
- Plasma display panels (PDPs)
- Medical equipment
Product Specification Overview
Products
- Aesthetically Colored Fabric-Over-Foam - Product camouflages gaskets that traditionally are visible on the outside of the chassis
- EcoGreen™ - Halogen-Free RoHS compliant EMI shields
- Poron Conductive Fabric - Hand-Held Device LCD Cushioning and EMI Protection
- Scuplted Foam - UL94 V0 rated product provides unmatched compression set performance while providing a relatively soft Compression Load Deflection (CLD) curve
Fabric*
| Fabric Types | Metal Coating | Conductivity (ASTM F390) | Application | Benefits |
| Ripstop | Ni/Cu, Sn/Cu | <0.07 ohms/square |
I/O or profile gaskets | Complex shapes, flame retardant, shear resistance |
| Taffeta | Ni/Cu | <0.07 ohms/square | Profile gaskets | Complex shapes, flame retardant |
| Knit Mesh | Ni/Cu | <0.1 ohms/square | I/O gaskets | Low cost, flame retardant |
Foam*
| Foam Types | Compression Set (ASTM D3574) | Color | Application | Benefits |
| Urethane | 5 to 10% | Charcoal or tan | I/O or profile gaskets | Flame retardant, low compression gasket, complex shapes |
| Thermoplastic Elastomer (TPE) | <20% | Off white | Profile gaskets | Complex shapes, flame retardant |
Pressure Sensitive Adhesive*
| Pressure Sensitive Adhesive | Application | Benefits |
| 3M™ 9485 or equivalent | High tack, shear resistant | High peel strength and temperature resistant |
Other Pressure Sensitive Adhesives can be provided. Contact Engineering for assistance.
The recommended operating compression for Fabric-Over-Foam EMI gaskets vary depending on the shape and size of the gasket.
Typically D-Shaped, Rectangular Shaped and Square Shaped Fabric-Over-Foam EMI gaskets should be compressed between 30% and 50% of the foam height.
C-Shaped Fabric-Over-Foam gaskets should be typically compressed between 50% and 75% of the gasket height.
Force Displacement Resistance (FDR) graphs are available upon request.
*Certain combinations of materials may not be available for all profiles or I/O gaskets. Please consult with Engineering when unsure.
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