|  | Low-Pressure Propellants
All ExxonMobil Chemical LVP Fluids were tested and found to be sufficiently soluble in numerous low-pressure propellants and can be used effectively in aerosol products.
| High-Pressure Propellants
CO2 solubility in hydrocarbon fluids is limited to a maximum of about 3.3 wt.% (1) but can vary significantly depending on the chemical composition of the particular hydrocarbon fluid. Because solubility of CO2 is different for various hydrocarbons, aerosol packagers may experience significant changes in can pressures when converting to different hydrocarbon fluids without making corresponding changes in CO2 loading.
In order to assist aerosol packagers in using ExxonMobil Chemical LVP Fluids, Ostwald Coefficients at various temperatures have been developed for the LVP Fluids. The Ostwald Coefficient of a gas-liquid mixture is the ratio of the volume of gas dissolved versus the volume of liquid. Use of Ostwald Coefficients will allow the aerosol packager to determine the amount of CO2 needed for each ExxonMobil Chemical fluid to achieve the desired can pressure. CO2 is more soluble in hydrocarbons with higher Ostwald Coefficients. The minimum Ostwald Coefficient required to fully dispense a product from an aerosol can has been identified as 0.5.
(1) Montfort A. Johnsen, "Carbon Dioxide and the Global Warming Issue", Spray Technology & Marketing, March 1995, petroleum distillates - 77°F at 100 psig.
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