SSP-502-60-V0 is 60-durometer, nickel-graphite shielding silicone that meets the flammability requirements of UL 94 V-0, a flame-testing standard from Underwriters Laboratories (UL).
This flame-retardant shielding silicone is supplied as a ready-to-mold compound, fully-cured conductive sheet stock, or as continuous rolls. SSP-502-60-V0 supports gasket fabrication through a variety of manufacturing methods.
UL 94 V-0
UL 94 compounds can help address concerns about the spread of fire from electrical overloads, component failure, insulation breakdowns, and loose connections. This UL standard defines a method for rating the ignition characteristics for polymeric parts used in electronic devices and equipment.
UL 94 is a single standard, but contains different flame ratings for different types of materials, such as solid rubber. There are also different flame ratings depending on the burn specimen’s orientation. For example, UL 94 V-0 applies to specimens that are positioned vertically during testing.
By filling a silicone elastomer with metal or metal-coated particles, a compound can combine enviromental sealing with electrical conductivity and EMI shielding. Nickel-coated graphite particles are a good choice because they balance cost with performance.
For SSP 502-60-V0, shielding effectiveness in the 20 MHz to 10 GHz range (E-field) may vary by form factor. Compression-molded sheets and ready-to-mold compounds have a typical shielding effectiveness of > 113 dB. Continuous rolls have a typical shielding effectiveness of > 100 dB.