TECHNICAL DATA SHEET 48 Flux-Cored Wire Activated Rosin Cored Wire for Lead-free and Leaded Alloys Product Description Kester 48 Flux-Cored wire is an activated rosin flux for cored solder wire designed for lead-free applications to enable soldering of most common metals. 48 has performance characteristics far exceeding standard RA fluxes. 48 builds on the performance of its predecessor Kester 44 Flux- Cored Wire with instant-action wetting to provide fast and reliable solder joints. Performance Characteristics: Unparalleled wetting performance Excellent solderability and fast wetting to a variety of surface finishes Eliminates the need and expense of cleaning Low spattering Low smoke and odor Classified as ROM1 per J-STD-004 RoHS Compliance Kester does not determine any applicable Restriction of Hazardous Substances (RoHS) exemptions for our lead containing products at the user level. (Applies only if this core flux is combined with a lead-free alloy.) Reliability Properties Copper Mirror Corrosion: Low Tested to J-STD-004, IPC-TM-650, Method 2.3.32 Corrosion Test: Low Tested to J-STD-004, IPC-TM-650, Method 2.6.15 Silver Chromate: Fail Tested to J-STD-004, IPC-TM-650, Method 2.3.33 Fluorides by Spot Test: Pass Tested to J-STD-004, IPC-TM-650, Method 2.3.35.1 Chloride and Bromides: 1.05% Tested to J-STD-004, IPC-TM-650, Method 2.3.35 48 Flux-Cored Wire Technical Data Sheet Issue: 17 May 2021 Page 1 of 4 TECHNICAL DATA SHEET Surface Insulation Resistance (SIR): Pass Tested to J-STD-004B, IPC-TM-650, Method 2.6.3.7 Surface Insulation Resistance (SIR) (typical): Pass Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3 Blank 48 10 10 Day 1 1.6*10 1.1*10 10 9 Day 4 1.2*10 9.2*10 10 9 Day 7 1.1*10 8.6*10 Spread Test (typical): Tested to J-STD-004, IPC-TM-650, Method 2.4.46 2 2 Area of Spread mm (in ) Flux-Cored Sn96.5Ag3.0Cu0.5 Sn63Pb37 Solder 285 213 (0.33) 335 (0.52) 275 219 (0.34) 361 (0.56) 44 220 (0.34) 342 (0.53) 48 245 (0.38) 419 (0.65) Availability 48 is available in a wide variety of alloys, wire diameters and flux percentages and roll sizes. The most common alloys are Sn96.5Ag3.0Cu0.5 and K100LD. Please refer to