Space Machine offers a standard product line of EMI/RFI gaskets covering waveguide sizes from WR28 thru WR650. EMI/RFI gaskets are conductive and are die cut from a silver impregnated elastomer. The standard gaskets are made to fit UG, CPR, and CMR flange types. However, additional sizes and configurations are available upon request. Space Machine EMI/RFI gaskets are made from conductive silicone elastomer with either Silver/Aluminum or Silver/ Copper fillers ( meets MIL-83528 Type B or K). These materials have very good shielding properties and conductivity, excellent sealing at temperature extremes, and have a long shelf life. See appendix P for Physical Properties and Temperature Range.