Robert McKeown Co., Inc. - SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles

The SOFT-SHIELD® 3500 fabric over foam (fof) product family are a group of low-closure force EMI/EMC gaskets. SS3500 offers a low cost competitive solution for EMI shielding and electrical grounding in sheer and compression.

The SS3500 product family is comprised of conductive fabric wrapped around open cell foam. This wrap around technology grounds the gasket from point to point, ultimately eliminating an EMI/EMC gap.

SS3500 typically requires less then 1lb/in (0.175/ mm) closure force, making it effective for low closure force applications. SS3500 takes less than 15% compression set. This is less than most other FOF’s on the market resulting in reliable/ repeatable shielding performance. SS3500 is an excellent alternative shielding solution to traditional spring finger type products.

The SS3500 product family is one of the most versatile EMI fof products offered to the market. Depending on mechanical and shielding requirements, the SS3500 can be made with different conductive jackets. Nickel-plated taffeta, Nickel-plated rip-stop polyester, halogen free nickel-plated rip-stop, etc. New geometric profiles are designed and released to the market on a regular basis. Profiles are engineered to optimize mechanical form fit and function while optimizing electrical performance. This technical data sheet will address the most common type FOF. Chomerics has to offer to market. Contact Chomerics for any other special design requirements and an updated profile list.

Product Features:

Low cost
> 100 (dB) shielding effectiveness 50 MHz to 10 GHz
Low closure force
Ultra-soft profiles that accommodate a wide range of tolerance gaps
Over 200 profiles available to the market
Readily available in bulk, cut to length or with cut features
ULV0
RoHS Compliant
REACH Compliant
Excellent low compression set properties
Abrasion/sheer resistant conductive jackets
Low contact resistance

Typical Applications:

Server Faceplates and blade cards
Panel seals
Cover seal
Door seals
Grounding tabs
EMI Window/vent seals
Improved ground paths
Low cost solutions are imperative

SOFT-SHIELD 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles

Unit of Measure

Items	77-11-3810 SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles	77-11-3811 SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles	77-11-3826 SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles	77-11-3808 SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles	77-12-3810 SOFT-SHIELD® 3500 Low Closure Force EMI Strip Gaskets - Knife-Edge Profiles
PSA Tape Backing	N/A No PSA	N/A No PSA	N/A No PSA	N/A No PSA	N/A W/PSA and Extended Liner
Profile Number	N/A 3810	N/A 3811	N/A 3826	N/A 3808	N/A 3810
Height	N/A 0.100 in2.5 mm	N/A 0.252 in6.4 mm	N/A 0.100 in2.5 mm	N/A 0.137 in3.5 mm	N/A 0.100 in2.5 mm
Width	N/A 0.500 in12.7 mm	N/A 0.752 in19.1 mm	N/A 0.445 in11.3 mm	N/A 0.492 in12.5 mm	N/A 0.500 in12.7 mm
Test Method Shielding Effectiveness	N/A CHO-TM-TP08
Shielding Effectiveness at 50 MHz to 10 GHz	N/A > 100 dB
Test Method Compression Deflection	N/A ASTM C165
35% Compression Deflection¹	N/A < 1 lb/in< 0.175 N/mm
Test Method Compression Set	N/A ASTM D3574
Compression Set	N/A < 15 %
Operating Temperature Range	N/A –40 to 70 ºC
Test Method Acrylic Adhesive Peel Strength	N/A ASTM D1000
Acrylic Adhesive Peel Strength Min.	N/A 4 lb/in0.7 N/mm
Recommended % Deflection	N/A 30 to 50 %
Test Method Flamability	N/A UL 94
Flamability	N/A V-0
Product Forms	N/A SQ, REC., D, C, P, L and Custom
Typical Applications	N/A Doors, Panels, Seams, Faceplates, Ground Pads
Method of Manufacture	N/A Wrapped foam
Jacket Material	N/A Ni/Cu Plated Taffeta Polyester
Foam	N/A Standard performance Urethane Foam
Attachment Method (PSA)²	N/A Non conductive, closed cell, acrylic PSA
Baseline EMI Shielding	N/A 80 dB
Shielding Effectiveness After Cycling	N/A Good
Softness	N/A Best
Compression Set ASTM D395 - Method B	N/A 70 ºC - 25 %
RoHS Compliant	N/A Yes
¹ 0.125 x 0.375 in gasket ² PSA typically covers less then 50 % of contact area. Upon compression the conductive fabric will make direct contact to the interface.