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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
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Item #

PSA Tape Backing

Profile Number

Height

Width

Shielding Effectiveness at 50 MHz to 10 GHz

35% Compression Deflection

77-11-3823 N/A No PSA N/A 3823 N/A 0.100 in2.54 mm N/A 0.394 in10.0 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3828 N/A No PSA N/A 3828 N/A 0.120 in3.00 mm N/A 0.320 in8.10 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3839 N/A No PSA N/A 3839 N/A 0.140 in3.56 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3840 N/A No PSA N/A 3840 N/A 0.100 in2.54 mm N/A 0.300 in7.60 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3842 N/A No PSA N/A 3842 N/A 0.197 in5.00 mm N/A 0.675 in17.1 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3844 N/A No PSA N/A 3844 N/A 0.080 in2.00 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3845 N/A No PSA N/A 3845 N/A 0.080 in2.00 mm N/A 0.675 in17.1 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3850 N/A No PSA N/A 3850 N/A 0.134 in3.40 mm N/A 0.625 in16.0 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3856 N/A No PSA N/A 3856 N/A 0.080 in2.00 mm N/A 0.300 in7.62 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3890 N/A No PSA N/A 3890 N/A 0.120 in3.05 mm N/A 0.400 in10.2 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3891 N/A No PSA N/A 3891 N/A 0.157 in4.00 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3894 N/A No PSA N/A 3894 N/A 0.215 in5.50 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3902 N/A No PSA N/A 3902 N/A 0.070 in1.80 mm N/A 0.564 in14.3 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3913 N/A No PSA N/A 3913 N/A 0.350 in12.7 mm N/A 0.629 in16.0 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3922 N/A No PSA N/A 3922 N/A 0.620 in15.75 mm N/A 0.110 in2.80 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-11-3926 N/A No PSA N/A 3926 N/A 0.122 in3.10 mm N/A 0.255 in6.50 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3823 N/A W/PSA and Extended Liner N/A 3823 N/A 0.100 in2.54 mm N/A 0.394 in10.0 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3828 N/A W/PSA and Extended Liner N/A 3828 N/A 0.120 in3.00 mm N/A 0.320 in8.10 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3839 N/A W/PSA and Extended Liner N/A 3839 N/A 0.140 in3.56 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3840 N/A W/PSA and Extended Liner N/A 3840 N/A 0.100 in2.54 mm N/A 0.300 in7.60 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3842 N/A W/PSA and Extended Liner N/A 3842 N/A 0.197 in5.00 mm N/A 0.675 in17.1 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3844 N/A W/PSA and Extended Liner N/A 3844 N/A 0.080 in2.00 mm N/A 0.500 in12.7 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3845 N/A W/PSA and Extended Liner N/A 3845 N/A 0.080 in2.00 mm N/A 0.675 in17.1 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3850 N/A W/PSA and Extended Liner N/A 3850 N/A 0.134 in3.40 mm N/A 0.625 in16.0 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
77-12-3856 N/A W/PSA and Extended Liner N/A 3856 N/A 0.080 in2.00 mm N/A 0.300 in7.62 mm N/A > 100 dB N/A < 1 lb/in< 0.175 N/mm
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