Abstract An experimental study has been performed to quantify the influence of process and material parameters on the impregnation of glass rovings with a polyamide melt under atmospheric pressure. The percentage of wetted fibres, determined from polished cross-sections, was used as a measure of the degree of impregnation. Because impregnation is largely stimulated by pins, one or more were used. The line speed and the pin diameters were varied. Variation of the roving pre-tension before the impregnation bath had little effect. The effect of viscosity was examined by using various melt temperatures. The influence of residence times on the pins and the melt viscosity suggests that the impregnation process can be described by Darcy's law. Different pin shapes were used to show the influence of spreading. The influence of the sizing was studied when using different rovings.