Cleans and fluxes in 1 operation saving time and money Flows smoothly into even the smallest cavity Multipurpose for use with 95/5, 60/40, 50/50, and 40/60 solder Smooth consistency makes it easy to apply Lead free and acid free - safe to use on potable water systems Special oil base protects the solder joint against corrosive attack Meets specification O-F-506, type 1A and A-A-51145, MIL-F-4995-2 Certified to NSF/ANSI standard 61, annexG