EMI Shielding Materials


7. Conductive Foam



Conductive Foam for EMI Shielding


Soft conductive foam EMI gaskets are ideal for applications that require conformability, excellent cavity-to-cavity EMI shielding, and superior conductivity at low compressive forces.

Conductive Foam is supplied as precision die-cut parts on rolls for high volume assembly. Schlegel Electronic Materials also provides globally supported, automated installation solutions.

Schlegel Electronic Materials’ conductive foam consists of either a foil-backed or Knitted/non-woven backed, nickel or nickel-copper plated base polyurethane foam and an electrically conductive, pressure-sensitive adhesive. Both Fire-Rated (UL 94 VO) and Non-Rated foams are available.

Data for Polyurethane foam sandwiched between knitted fabric and Non-woven fabric.



Sizes

• 0.7 ohms/sq. for nickel plated foam
• 0.09 ohms/sq. for nickel-copper plated foam

Volume Resistivity

• 0.040 ohms-inch for nickel plated foam
• 0.032 ohms-inch for nickel-copper plated foam

Shielding Effectiveness

70dB avg. from 20 MHz to 10 GHz (per IEEE-299 modified)


CLD at 25% Compression

Part Number: CF-78-30NR	3mm Non-rated polyurethane foam
Average	3.9 PSI
Standard Deviation	1.05 PSI
N	5

Part Number: CF-78-30FR	3mm Non-rated polyurethane foam
Average	2.1 PSI
Standard Deviation	0.0894 PSI
N	5

Compression Set

Compression set for standard foam: 10.6% at 30% compression, and 25.5% when compressed 50% of free height at ambient temperature.


Service Temperature

General Service Temperature: -40 degrees Celsius (-40 degrees Fahrenheit) to 70 degrees Celsius (158 degrees Fahrenheit) in accordance with ASTM D 3574 > Standard Test Methods for Flexible Cellular Materials, including Urethane foams.