Abstract By exploring the links between laboratory-scale gasification data (e.g. slag viscosity measurements, char reactivity considerations) and the performance of the same coals under realistic pilot-scale conditions, we are provided with a dataset that allow us to refine coal test procedures for entrained flow gasification, understand the entrained flow gasification process in significantly more detail than previously, and gain some new insight into how coal reactivity and slag viscosity properties interact to define operating envelopes for specific gasification technologies. The first paper in this two-part series presented a detailed characterisation of a suite of Australian coals using laboratory-scale gasification facilities. This paper presents gasification data obtained from pilot-scale testing of these same coals, and explores the links between laboratory data, coal assessments made using these data, and the performance of the coals under realistic conditions. The results demonstrate a high degree of consistency between laboratory indications of coal reactivity and coal gasification behaviour at pilot scale. This work also demonstrates the impact of interactions between coal conversion properties and slag formation and flow behaviour, and how these interactions dictate operational parameters for the gasifier.