materials are ideally suited for deployable components and structures because they possess high strain to failure ratios high specific modulus and low density by contrast most traditional materials used for deployable structures have only two of these three attributes initial emc development efforts have targeted space applications tremendous support for the development of ctd 39 s emc materials has been received from nasa the air force bmdo and other government agencies and the aerospace industry emc materials have the potential to enable a new generation of space deployable components and structures which would eliminate nearly all the limitations and shortfalls of current spacecraft deployable technologies with that as a background on the preferred material for the sleeve 16 those skilled in the art will appreciate that the original dimensions for fabrication of sleeve 16 will approximate its desired final dimensions in the wellbore after activation as shown in fig2 the outer dimension 18 needs to be large enough after activation to sit firmly against the troublesome zone 12 in a way that one or more than one sleeve 16 can isolate the zone upon deployment rubber end rings could be used to enhance the sealing ability at the same time the.