EMI/RFI

March 12, 2001

Keeping sensitive data in and interference out, TEMPEST-qualified EMI/RFI shielding surfaces from Hayden provide a first line of defense in data security. HC302-E and HC303-E thermal sprayed shielding surfaces provide an economical way to maintain the light weight and flexibility of your existing non-conductive enclosures while providing the electrical integrity and security of steel.

Typical Applications:

  • Computer and Display Housings
    Active capture of emissions by grounding of the shield surface significantly reduces the likelihood of effective data piracy through the monitoring of stray emissions.
  • Navigational and Telemetry Equipment
    Directional use of shielding surfaces can provide a barrier against ambient emissions that may detrimentally affect the accuracy of sensitive monitoring equipment.
  • Communications Transmission Environments
    Protection of equipment and personnel in radio and television transmission facilities, microwave rebroadcast units, and similar high-ambient-RF environments.

Developed to meet the needs of government and military contractors, our coatings provide shielding performance superior to metallic paint (see table below), and with far higher bond strength and resistance to flaking. Line-of-sight spray application allows for surfaces of nearly any geometry to be protected, and high deposition rates mean fast process time, rapid turnaround and affordable pricing.

Shield Material Specific Gravity Wet Density Resistivity & ohm, per square for one mil Continuous-use temperature, °F Shelf life, months Drying time, hours Shielding effectiveness, dB
10 MHz 100 MHz 1 GHz
Paint Pure Silver Acrylic (1-part system) 3.9 1.9 0.004 -65 to 200 12 1 67 93 97
Pure Silver Epoxy (2-part system) 2.8 1.0 0.1 -25 to 180 24 3 59 81 87
Pure Silver Solvent 3.6 1.5 0.05 -65 to 200 12 1/2 57 82 89
Nickel 3.95 1.9 3.0 -60 to 180 6 24 35 47 57
Carbon 0.8 0.4 10.0 -65 to 255 12 24 27 35 41
Thermal Spray HC302E 7 7 0.002 -65 to 675 n/a 0 106 92 98
HC303E 7 7 0.002 -65 to 675 n/a 0 106 92 98

Data courtesy TAFA, Inc., Concord, NH.

The Federal Communications Commission specifies that most devices must remain passively susceptible to impingent interference.* Minimize risk and reduce compromising emissions with conductive surfaces from Hayden Corporation.

*See FCC 79-555/14686