Use of silane coupling agents enables the significant improvement of the performance of thermoplastic composites. Water-borne silane coupling agents may offer a more environmentally friendly alternative. Compositions of nylon 66 with silane and water-borne silane treated mineral fillers: clay, talc, mica and wollastonite were prepared and comparatively evaluated. Filler dispersion, mechanical properties, and thermoplastic matrix-mineral substrate interface were studied. I t may be gathered from the results of the study that water-borne silanes by themselves or in combination with some additives exhibit equal or better performance than regular silanes.