A novel strategy for the preparation of natural rubber/chlorobutyl rubber/nanoclay (ciir/nr/ cloisite10a and nanomer i.44p) nanocomposite membranes are reported for the first time for barrier applications towards oxygen and nitrogen gases. the membrane formulations consisting of 70 phr chlorobutyl rubber and 30 phr natural rubber to which cloisite 10a nanoclay having 2mbht organic modification and nanomer i.44 p having 35-45 wt. %, dimethyl dialkyl (c14-c18) amine having high cation exchange capacity (cec) of about 70–150 meq/100 g were added. composites containing 0, 2.5, 5, 7.5 and 10 phr of cloisite 10a and nanomer i.44p nanoclays were evaluated. the permeability of the nanocomposite membranes to nitrogen and oxygen gases was carefully measured. the incorporation of clay into natural rubber (nr)/chlorobutyl rubber (ciir) nanocomposites provides highly impermeable membranes which are superior to expensive ciir nanocomposite membranes. in this invention, low amount of fillers were used to achieve a highly impermeable system. the highly gas impermeable nature of the blend nanocomposites is due to the creation of a new type of morphology, where the nanofillers are located at interfaces of the blends and chlorobutyl matrix. this results in the formation of a new type of tortuous path as, where the nanoclay platelets are located at interfaces of the blend. the examined systems were arrived at good impermeability without the addition of carbon black, processing oils etc for the development of membranes having phase separated. therefore, the invention is a green approach towards the development of impermeable membranes towards oxygen and nitrogen.