Diisopropylnaphthalene is widely used as a solvent in carbonless copy paper, where it helps encapsulate dyes in microcapsules that release color upon pressure. It is valued for its low volatility and high solvating power, making it effective in specialty printing applications. Additionally, it serves as a heat transfer fluid in industrial systems due to its thermal stability and low odor. It is also employed in pesticide formulations as a carrier solvent to enhance the dispersion and penetration of active ingredients. Its non-polar nature makes it suitable for use in dielectric fluids and as a component in some lubricant formulations.