of nickel fiber loading the elastomer matrix is that set forth in table i however other rubber materials as described hereinabove will produce substantially similar results table ii______________________________________ni fiber loading in by electricalweight of unloaded rubber resistance ohm cm______________________________________15 0 59516 0 27817 0 37618 0 11319 0 44020 0 08821 0 166______________________________________ the gasket set forth above containing 20 percent by weight of the unfilled elastomer was tested for shielding effectiveness the following table illustrates attenuation of emi in decibels a logarithmic measurement wherein 10 db indicates 90 of emi is dissipated 20 db indicates a 99 emi dissipation etc table iii______________________________________frequency mhz shielding effectiveness db______________________________________200 53 7250 53 0300 50 5350 56 6400 66 2450 55 2500 53 2550 56 2600 60 8650 52 6700 55 5750 51 4800 53 1850 56 6900 51 6950 49 01000 51 7______________________________________ it will be appreciated that emi attenuation is in part directly related to electrical resistance it therefore can be seen that attenuation will vary with nickel fiber loading in correlation with the relationships of table ii that is at a particular frequency as fiber loading increases resistance decreases and shielding effectiveness improves because of the nickel fiber aspect ratios.