NOVELTY - A fluid composition comprises base fluid; and boron nitride-based materials dispersed in the base fluid.    USE - In thermal management, corrosion resistance, and electrical insulation applications in tribology fields, such as electrical machines (e.g. electrical transformers, motors and engines), metal-mechanic fields (e.g. lubricants and metal-cutting fluids), oil and gas fields (e.g. drilling, extraction process) and the electronic circuit industry; for electrical transformers and electrical motors/engines; for downhole drilling fluid additives for oil and gas industry in wellbore imaging, logging while drilling (LWD) and monitoring while drilling (MWD); as coolants and lubrication fluids in rubber drilling/machining operations in automobile tire industry; in concentrated solar power (CSP) plants as additives to base heat transfer fluids (HTFs); as components of transmission fluids; as components of heat exchangers; and for electrical insulation.    ADVANTAGE - The fluid composition has an enhanced thermal conductivity of 5-80%, preferably 5-30% relative to the base fluid. The fluid composition combines higher thermal conductivity (keeping electrical insulation) than those of prior art nano-fluids; and additionally possess optimal corrosion resistant properties, especially when hexagonal boron nitride is utilized as a boron nitride-based material. The composition remains stable without use of any dispersing agents (e.g. surfactants) or other additives (i.e. fluid compositions with low amounts of boron nitride-based materials (e.g. 0.01-0.10 wt.%) remains highly stable in base fluids, preferably mineral oil, with high shelf life (e.g. more than 3 months) without any surfactants). The composition is used to dielectrically insulate the internal components of electrical devices. This in turn reduces component size and hence reducing costs. The enhanced thermal conductivity of the composition also simultaneously decreases friction heat loss and torque required of drilling process to allow for significant energy savings. The higher thermal conductivity can speed the heat transfer rate and allow for smaller concentrated solar power plant design; and increases heat transfer efficiency, and allows reduction in heat exchanger sizes which may in turn reduce heat exchanger costs. By utilizing advanced heat transfer and tribology properties of the fluid compositions (e.g. hexagonal boron nitride containing fluids), the composition offers less wear and tear on the engine gears; hence prolongs engine life-time or allows more extreme conditions for more advanced engine designs. Thus the fluid composition has an impact in reducing energy consumption, reducing costs, and increasing product reliability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for making fluid composition involving dispersing boron nitride-based materials in a base fluid.