TECHNICAL DATA SHEET 44 Flux-Cored Wire Activated Rosin Cored Wire for Lead-Free and Leaded Alloys Product Description Kester 44 Flux-Cored Wire is an activated rosin formula for use in flux-cored solder wire. 44 has virtually dominated the field of activated rosin core solders for well over five decades. An outstanding performance feature of this flux is the instant- action wetting behavior. The high mobility and fast-spreading action of this flux results in more reliable production line soldering. Under IPC J-STD-004, 44 is classified as ROM1. Despite the increased activity and soldering performance, 44 passes both 85 C/85% RH and 40 C/90% RH SIR test methods. Performance Characteristics: High activity RA formulation Passes both 85 C/85% RH and 40C/90% RH IPC SIR testing Excellent solderability to a wide range of metallizations Industry standard RA cored wire for decades 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: Moderate Tested to J-STD-004, IPC-TM-650, Method 2.3.32 Corrosion Test: Moderate Tested to J-STD-004, IPC-TM-650, Method 2.6.15 Silver Chromate: Fail Tested to J-STD-004, IPC-TM-650, Method 2.6.33 Chloride and Bromides: 0.44% Tested to J-STD-004, IPC-TM-650, Method 2.6.35 44 Flux-Cored Wire Technical Data Sheet Issue: 17 May 2021 Page 1 of 3 TECHNICAL DATA SHEET Fluorides by Spot Test: Pass Tested to J-STD-004, IPC-TM-650, Method 2.6.35.1 Surface Insulation Resistance (SIR) 40 C/90% RH, IPC (typical): Pass Tested to J-STD-004B, IPC-TM-650, Method 2.6.3.7 Surface Insulation Resistance(SIR), IPC (typical): Pass Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3 Test Conditions: 85 C, 85% RH, 7 days, 100V Blank 44 9 8 Day 1 7.46*10 2.2*10 9 9 Day 4 2.88*10 4.9*10 9 9 Day 7 7.7*10 7.14*10 Availability 44 is available in a wide variety of alloys, wire diameters, flux percentages and roll sizes in both leaded and lead-free alloys. The most common alloys are Sn63Pb37 and Sn60Pb40. Please refer to