A dispersion of a particulate inorganic material comprises a non-aqueous liquid medium containing a particulate inorganic material dispersed therein and an effective amount of one or more dispersing agent which serves to maintain the particulate inorganic material in dispersion in the non-aqueous medium, wherein the particulate inorganic material has an average particle size (d.sub.50) less than about 9 .mu.m, the particulate inorganic material is present in the non-aqueous medium in an amount greater than about 70% by weight of the dispersion and the viscosity of the dispersion is less than about 150 Pas measured at room temperature on a Bohlin rheometer using a 20 mm cone/plate at a shear rate of 1/sec. A substantially dry particulate inorganic material surface treated with the dispersing agent and optionally one or more hydrophobising surface treatment agent, and capable of forming the said dispersion, is a further feature of the invention.