Cleans and fluxes in 1 operation, Stays firm and stable in hot weather, Multipurpose for use with 95/5, 60/40, 50/50, and 40/60 solder, Lead free and acid free, safe to use on potable water systems, Low corrosivity, low scorching, and low spattering, Meets OF 506 type 1 A and A-A-51145