Kester 24-9574-1404 is a 1 lb spool, of lead-free, Ultrapure K100LD, RA flux-cored solder wire with a diameter of .050 inches. It has a #66 core size and a 48 (RA) flux type.
Ultrapure K100 LD (is a lead free solder alloy):
Compares favorably to other low-cost, lead-free alloys of tin and copper in terms of wetting and flow characteristics.
Low cost, lead-free alloy
Bright, smooth solder joints with no visible shrinkage effects
Excellent through-hole penetration and topside fillet
Low dissolution of copper from boards and components into solder pot
20% Lower dross rate than SN63Pb37 in laboratory tests
Less corrosive to solder pots than SAC305
48 Activated Rosin Cored Wire (lead-bearing & lead-free alloys):
Kester 48 Activated Rosin Flux for cored solder wire was developed for lead-free applications to enable soldering of most common metals. Kester 48 has performance characteristics far exceeding standard RA fluxes. Kester 48 builds on the performance of its predecessor Kester 44 with "instant-action" wetting to provide fast and reliable solder joints.
Performance Characteristics of 48 Activated Rosin:
Unparalled wetting performance
Excellent solderability and fast wetting to a variety of surface finishes
Eliminates the need and expense of cleaning
Low smoke and odor
Classified as ROM1 per J-STD-004
Kester 48 vs Kester 44:
Kester 48 provides a higher level of activity than Kester 44
Kester 48 dramatically reduces splattering by 50+% over Kester 44
Kester 48 resides are transparent and nearly colorless compared to the traditional amber appearance of Kester 44
Kester 48 was designed for lead-free alloys
This product meets the requirements of the RoHS (Restriction of Hazardous Substances) Directive, 2002/95/EC Article 4 for the stated banned substances. (Applies only if this core flux is combined with a lead free alloy)