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EMI Gasket Materials for Medical Devices: Thin, Small, Lightweight Solutions

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In Brief

Medical device designers need gasket materials that resist electromagnetic interference (EMI), provide environmental sealing, and support thin, small, lightweight designs. SSP-502 shielding silicones meet these requirements.

Specialty Silicone Products (SSP) makes EMI gasket materials that support thinner, smaller, and lighter-weight medical device designs. SSP’s 502-series is a family of EMI elastomers that use silicone rubber as the base material and that contain metal or metal-coated particles. The elastomer provides environmental sealing and insulation. The metallic particles provide EMI shielding and electrical conductivity.

 

Silicones are natural insulators that can withstand water, ozone, ultraviolet light (UV), and a wide range of temperatures. These synthetic elastomers can also resist some chemicals. SSP-502 shielding silicones are supplied in a range of durometers (Shore A) and carry both material and electrical specifications. They are available in moldable compound (MC), sheet stock (SS), and continuous rolls (CR).

 

This table explains.

Product

Shore A

Tensile (psi)

Elongation (%)

Tear B

(ppi)

Max V.R. (ohm/cm)

Specific Gravity

Availability

SSP-502-30

33

100

400

N/A

1.5

1.65 - 1.85

MC, SS

SSP-502-40

45

150

200

25

0.030

1.80 – 2.20

MC, SS, CR

SSP-502-55

55

150

200

25

0.040

1.90 – 2.05

MC, SS, CR

SSP-502-65

65

200

200

35

0.040

1.90 – 2.05

MC, SS, CR

SSP-502-75

75

270

250

35

0.040

1.90 – 2.05

MC, SS

 

SSP-502 shielding silicones are filled with nickel-coated graphite particles that provide a typical shielding effectiveness that’s comparable to conductive silicones with silver-coated particles. A third-party shielding report is available on-line. Silver, a precious metal, is typically more expensive and also subject to price volatility. SSP’s SpecShield™ materials also have shorter lead times and lower minimum order quantities.

 

Interested in Learning More about Specialty Silicone Products? Take a look here:

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