48 has performance characteristics far exceeding standard RA fluxes. 48 is classified as ROM1 per J-STD-004. Performance Characteristics: Unparalleled wetting performanceExcellent solderability and fast wetting to a variety of surface finishesEliminates the need and expense of cleaningClassified as ROM1 per J-STD-004 Cleaning The 48 series possesses excellent fluxing ability.