Solvent is ideal nPB replacement

PWR-4 is available in aerosol or bulk for vapor-degreasing, ultrasonic and immersion cleaning. It is engineered to remain stable and effective over thousands of cycles in vapor degreasing equipment. PWR-4 is stabilized and safe for metals such as aluminum, magnesium, titanium, and brass.

PWR-4 Flux Remover (part #3401)  cleans the most difficult baked-on R, RMA & no-clean fluxes from electronic assemblies. PWR-4 Industrial Maintenance Cleaner (#3400)  cleans difficult greases and oils from electronics, relays, and motors.

n-Propyl Bromide (nPB), Trichloroethylene (TCE), and Perchloroethylene (Perc) are three examples of harmful chemicals that are commonly used in industrial applications because they are non-flammable, have high solvency, and are relatively inexpensive. Because of safety concerns, they are under close scrutiny by OSHA, EPA, and local agencies. For example, the American Conference of Governmental Industrial Hygienists (ACGIH) recommends a 10 ppm  time-weighted average threshold limit for nPB, but has proposed a lower 0.1 ppm (ACGIH 2013). That’s because nPB  is a suspected human carcinogen, and has shown to negative impact neurological and reproductive  functioning.