Advances in Formulation Technology For Solvent Cleaning Systems Based on normal-Propyl Bromide

摘要

Cleaning with solvent systems based on n-propyl bromide (nPB) has become an important component of many manufacturing and maintenance operations where the ultimate level of performance has a critical dependence on the efficiency of the cleaning operation. The nPB-based cleaners have proven themselves valuable alternatives to the once popular chlorocarbons and hydrochlorocarbons. These latter solvents have been largely banned or restricted because of toxicological and/or environmental considerations. n-Propyl bromide has nearly identical physical and cleaning properties to 1,1,1 -trichloroethane (1,1,1 -T or TCA), but it has a low Ozone Depletion Potential (ODP) and a low Global Warming Potential (GWP). A growing body of evidence shows that nPB-based solvents are safe, effective and cost-efficient alternatives for precision cleaning applications. Current commercial applications include cold cleaning and vapor degreasing of parts soiled with solder fluxes, greases, adhesives, coolants, resins, oils and lubricants. New formulations have now been developed which broaden the scope of potential applications for the nPB-based cleaning solvents. Case histories and a discussion of relevant toxicological, environmental and regulatory considerations will be included.