Fumed silica provides mechanical reinforcement to the silicone matrix in silicone elastomers. Thus, the incorporation of fumed silica and its dispersion quality determines the product properties. This work highlights several considerations when characterizing fillers incorporated into a silicone matrix. When measuring particle size using laser diffraction, the solvent choice and dilution process are critical to ensure the preservation of particle size as-processed. Control of solvent viscosity and mixing intensity is necessary to avoid overshearing the particles, leading to smaller apparent particle size. On the other hand, the surface chemistry of the fillers across samples may also vary depending on the extent of surface treatment during processing. Thus, the solvent selection also determines the solvent-particle interaction, which, if unfavorable, can induce agglomeration and instead lead to bigger apparent particle size.