Water-free cleaning processes using HFE hydrofluoroethers in combination with a cosolvent

1 Water-free cleaning processes using HFE (hydrofluoroethers) in combination with a cosolvent 

The primary function of the rinse sump is to remove the fluorochemicaFcosolvent mixture and the soil dissolved in it. Following immersion in the rinse liquid, the parts are moved into the vapor phase for a final rinse with pure fluorochemical vapor. Finally, the parts are lifted into the freeboard zone, where any remaining fluorochemical rinsing agent evaporates from the parts and returns to the sump by condensation from eooling eoils. At this point, the cleaning cycle is complete and the parts are elean and dry. 

Furthermore, pure Novee HFEs ean be used for the removal of light soils, halogenated eompounds like fluorinated greases or oils, and other particles. 

Since the boiling points of these two HFEs lie at the upper range covered by the traditional ODSs such as HCFC-141b, CFC-113 and 1,1,1-trichloroethane, abetter cleaning efficiency is provided due to the increase in solubility of most soils with temperature. 

Like ODS solvents, the HFEs are non-flammable, which leads to very simple and thus inexpensive equipment designs. 

---