Solid particles are usually coated by hot-melt or solvent-based methods.The former involves heat that could have a detrimental effect on heat-sensitive materials,whereas the latter causes a residual organic solvent issue.Thus,there is interest in solvent-free coating processes.Particle coating methods based on supercritical fluid (SCF) technology are prime candidates to eliminate organic solvents.They consist of dissolving a coating material in SCF and then changing T and P so that the coating material becomes insoluble and deposited on the surface of particles.Phase behavior of coating materials in SCFs should be known for implementation of the coating process.We tried to apply the SCF coating method to produce a plastic-bonded explosive (PBX),an explosive material in which explosive powder is bound in a matrix using a binder like a polymer or a plastic additive.The plastic matrix tends to absorb shocks,making the PBX very insensitive to accidental detonation.The phase behavior data are presented for the binder or coating materials in high-pressure fluids.As binder or coating materials,we studied ethylene vinyl acetate (EVA: 40% VA),HyTemp? 4454 (a polyacrylate elastomer from Zeon Chemicals Co.),Estane? 5703 (a thermoplastic polyurethane from Lubrizol Corp.),Viton?-A (a fluoroelastomer from DuPont Chemical Co.),dioctyl adipate (DOA),and dioctyl phthalate (DOP).Carbon dioxide (CO2),dimethyl ether (DME) and chlorodifluoromethane (HCFC-22) were used as solvents for the binder or coating materials.The cloud point curves were measured for the binary pairs of coating material + solvent using a high-pressure equilibrium apparatus equipped with a variable-volume view cell.The cloud point pressures were observed as a function of the temperature and the concentration of binder or coating material.The phase behavior data presented here will be useful for establishing operating conditions when coating energetic materials with the binders using high-pressure fluids.