Hybrid silica- MWCNT particles were produced by the growth of nanotubes onto spherical, mesoporous silica gel particles using CVD. The aims were to develop CNT-based particles that disperse easily in polymers to form stable electrically-conductive networks without any significant increases in viscosity. Epoxy resin suspensions of these hybrid particles (SG6_3) were studied compared to suspensions of discrete (non-grafted) CNTs (NC) in the same resin Visual observation revealed striking differences between the SG6_3 and NC suspensions. For example, the former flowed easily from the jars in which they were mixed even when the loading was increased to 5 wt.% (equivalent to 1.68 wt. % of CNT). These suspensions were also quite stable and upon tilting the jars after standing for 24 hours no obvious sedimentation was observed. In contrast, a spatula was required to transfer all of the NC suspensions, even the lowest loading of 0.17 wt. %. The rheological properties of the suspension were studied using rotational and dynamic shear tests using a Thermo Scientific MARS II rheometer. The complex viscosity of suspensions containing up to 5 wt.% of SG6_3 (containing 1.68 wt.% of grafted CNT) remained essentially unchanged, whereas an increase of up to five orders of magnitude resulted upon the addition of 1.68 wt.% of non–grafted CNTs. Whilst rheological studies indicated that SG6_3 did not form a percolated network at addition levels of 5 wt.%, addition of only 2 wt.% (0.66 wt.% CNT) was found to form an electrically – conductive percolated network in an epoxy resin composite with conductivity ~ 10-4 S/m.