SSP-2551 is a 72-durometer nickel-aluminum flluorosilicone. Tested to MIL-DTL-83528. Performs to 40 GHz. Use instead of CHO-SEAL 6503.


SSP-2551 is a 72-durometer, nickel-aluminum fluorosilicone that's been tested to MIL-DTL-83528. This EMI elastomer performs to 40 GHz and can be used for military electronics due to MIL-DTL-461F requirements, specifically Section 5.18 RE103, radiated emissions, antenna spurious and harmonic outputs (10 kHz to 40 GHz). 

SSP-2551 also provides galvanic corrosion resistance and is ideal for marine environments such as the decks of aircraft carriers, where flange gaskets are subjected to salt spray, jet fuel, de-icing fluids, exhaust fumes, and electromagnetic interference (EMI). Because it is a fluorosilicone, SSP-2551 resists fuels and solvents.

EMI Shielding with Fuel and Solvent Resistance 

SSP-2551 is filled with nickel-coated aluminum particles that provide effective EMI shielding and electrical conductivity. Compared to other EMI elastomers, nickel-aluminum products deliver the highest shielding effectiveness after long-term age testing. These particle-filled elastomers also have low transfer impedance. They resist fuels and solvents because fluorosilicone is the base material. 

MIL-DTL-83528 and ASTM D991 Testing 

SSP-2551 was tested according to MIL-DTL-83528 shielding effectiveness, a U.S. military specification for electrically-conductive elastomeric shielding gaskets. This EMI fluorosilicone has a shielding effectiveness of 112 dB at 20 MHz to 10 GHz. Volume resistivity, a measure of an insulating material’s resistance to leakage current through its body, was tested according to ASTM D991 and measured 0.03 ohm / cm. 

ASTM E595 Outgas Testing

Samples of SSP-2551 were submitted to an independent laboratory for Outgas Testing in accordance with ASTM E595. These samples include batches of material with and without pressure-sensitive adhesive. All samples met ASTM E595 outgas requirements.

Compression Deflection

Compression deflection is a measurement of the force required to compress a material to a set amount. Testing for this SSP material  was performed according to ASTM D75 Method A. Download the Compression Deflection Data for a chart with compressive stress [psi] vs. deflection [%].

CHO-SEAL 6503 Offset

SSP-2551 can be used instead of CHO-SEAL 6503. CHO-SEAL®  is a registered trademark of Parker Chomerics. SSP also makes other CHOSEAL offsets.

Learn More About SSP-2551 

SSP-2551 is dark gray in color and has thermal stability range of -60° C to 220° C. This EMI elastomer is supplied as fully-cured, conductive sheet stock; continuous extrusion profiles; and ready-to-mold compounds. Two shielding reports, an outgassing report, compression deflection data, and a technical data sheet are available.