Low Outgas Extreme Low-Temperature EMI Silicone

SSP502-502-55LT is a 55-durometer EMI/RFI silicone that is filled with nickel-coated graphite particles. It has low levels of outgassing for high vacuum environments and withstands extremely low temperatures. Applications include EMI gaskets and EMI O-rings for satellites and space vehicles. 

Like SSP’s other low outgassing EMI/RFI silicones, SSP502-502-55LT has low minimum order quantities (MOQs) and short lead times. Contact us to discuss your application or request a quote.

ASTM E595 Outgassing

ASTM E595 is a standard test method for total mass loss (TML) and collected volatile condensable materials (CVCM) from outgassing in a vacuum environment. According to ASTM E595 testing, SSP-502-55LT has a TML of 0.15% and a CVCM of 0.05%. Both values are within the limits that NASA typically uses. 

TR-10 Low Temperature Performance

ASTM D1329 is a standard test method (the TR test) for evaluating a rubber’s retraction at lower temperatures. TR-10 is the temperature at which a vulcanizate retracts 10%. SSP-502-55LT has a TR-10 low-temperature capability of -70°C.

EMI Shielding Effectiveness

SSP502-55LT has an electric field (E-Field) shielding effectiveness of greater than 113 dB for the 20 MHz to 10 GHz frequency band. Its volume resistivity, an indirect measurement of EMI shielding effectiveness, is 0.01 ohm-cm.

Form Factors for SSP502-55LT

SSP502-55LT is available in three form factors. 

• ready-to-mold compound
• fully-cured, conductive sheet stock
• continuous rolls up to 15 inches wide

EMI Gaskets and EMI O-Rings

Depending on the form factor, fabricators can produce EMI gaskets or EMI O-rings.

• EMI gasket fabrication methods include compression molding and die cutting.
• For EMI O-rings, fabricators can use either cold bonding or vulcanization.     

Materials Testing

SSP offers certificates of analysis (COAs) with batch-level testing for SSP502-55LT. Our in-house testing laboratory can also provide you with certificates of conformance (COC) instead.

Storage and Specifications

Catalyzed shielding materials are ready for press-cure molding and have a shelf life of six months. Uncatalyzed materials last as long as 1 to 2 years, and cold storage will extend shelf life. 

For complete product specifications, see the datasheet.