The effects of applying titanate (TYZOR((R)) TPT) and silane (DYNASYLAN VTMO) coupling agents to wet ground muscovite mica in nylon-6 composites are described. Nylon-6 composites of 5-40 wt % filler loadings were compounded using an APV Baker twin-screw extruder. Mica (25 wt %) brought about an increase in the Young's modulus, flexural strength, and flexural modulus but did not produce significant variations in tensile and impact strength. Hence different coupling agents were employed. It was observed that titanate coupling agent improved the tensile strength and the Young's modulus of the composites much while the impact properties were enhanced by the silane coupling agent. An attempt was made to use epsilon-caprolactum in improving the interfacial adhesion of the filler and the matrix. It was observed that epsilon-caprolactum improved the flexural modulus of the composites most. The effect of coupling agents on the dielectric strength, heat distortion temperature, and morphology were also investigated. (c) 2006 Wiley Periodicals, Inc.