® Technical Data Sheet 44 Flux-Cored Wire Activated Rosin Cored Wire for Lead-Free and Leaded Alloys Product Description Kester 44 Rosin Flux 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 ■ Excellent solderability to a wide ■ Classified as ROM1 per J-STD-004 range of metalizations ■ Passes both 85°C/85% RH and 40°C/90% RH IPC SIR testing ■ Industry standard RA cored wire for decades 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 Chloride and Bromides: 0.44% Surface Insulation Resistance (SIR), Tested to J-STD-004, IPC-TM-650, Method Tested to J-STD-004, IPC-TM-650, Method IPC (typical): Pass 2.3.32 2.6.35 Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3 Fluorides by Spot Test: Pass Test conditions: 85°C, 85% RH, 7 days, 100V Corrosion Test: Moderate Tested to J-STD-004, IPC-TM-650, Method Tested to J-STD-004, IPC-TM-650, Method Blank 44 2.6.35.1 2.6.15 Day 1 7.46*109 Ω 2.2*108 Ω Surface Insulation Resistance (SIR) Silver Chromate: Fail Day 4 4.9*109 Ω 2.88*109 Ω 40°C/90% RH, IPC (typical): Pass Tested to J-STD-004, IPC-TM-650, Method Tested to J-STD-004B, IPC-TM-650, Method Day 7 7.7*109 Ω 7.14*109 Ω 2.6.33 2.6.3.7 Global Headquarters: 800 West Thorndale Avenue, Itasca, IL USA 60143 ■ Phone: +1 800.2.KESTER ■ Fax: +1 630.616.4044 Asia-Pacific Headquarters: 61 Ubi Avenue 1 #06-01 UB Point, Singapore 408941 ■ Phone: +65 6.449.1133 ■ Fax: +65 6.242.9036 European Headquarters: Ganghofer Strasse 45, 82216 Gernlinden, Germany ■ Phone: +49 (0) 8142 4785 0 ■ Fax: +49 (0) 8142 4785 61 Asia Manufacturing: Hengqiao Road, Wujiang Economic Development Zone ■ Suzhou, Jiangsu Province, China 215200 ■ Phone: +86 512.82060807 ■ Fax: +86 512.8206 0808 ■ Website: www.kester.com ■

® Application Notes Availability 44 flux-cored wire 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 www.kester.com for more information. Note: Core size 50, 58 and 66 = 1.1%, 2.2% and 3.3% flux core, respectively. Process Considerations Solder iron tip temperatures are most commonly between 315-343°C (600-650°F) for leaded alloys and 371-400°C (700- 750°F) for lead-free alloys. Heat both the land area and component lead to be soldered with the iron tip prior to applying the solder wire to land area or component lead. Do not apply the wire directly to the soldering iron tip; doing so will shorten the life of the soldering tip. Additional liquid flux should only be used as a last resort. Any flux applied to the solder location should be kept to the area of the connection being reworked. If needed, Kester 186 or Kester NF372-TB may be used as a compatible liquid fluxes to aid in reworking soldered joints. Kester 186 and Kester NF372-TB are also available in Flux-Pens® for optimum board cleanliness. Cleaning 44 possesses excellent fluxing ability; the flux residues are non-corrosive, non-conductive and do not require removal for most applications under normal conditions of use. IPA will not clean the residues off the surface of the circuit board after the soldering process. If removal is required, a saponifier or cleaning agent specifically designed to clean a no-clean flux is required to clean the residues. Please contact Kester Technical Support for further information. Storage and Warranty Period Storage must be in a dry, non-corrosive environment between 10-40°C (50-104°F). The surface may lose its shine and appear a dull shade of grey. This is a surface phenomenon and is not detrimental to product functionality. Flux-cored solder wire has a limited warranty period determined by the alloy used in the wire. For alloys containing more than 70% lead, the warranty period is 2 years from the date of manufacture. Other alloys have a warranty period of 3 years from the date of manufacture. Health and Safety This product, during handling or use, may be hazardous to your health or the environment. Read the Safety Data Sheet (SDS) and warning label before using this product. Global Headquarters: 800 West Thorndale Avenue, Itasca, IL USA 60143 ■ Phone: +1 800.2.KESTER ■ Fax: +1 630.616.4044 Asia-Pacific Headquarters: 61 Ubi Avenue 1 #06-01 UB Point, Singapore 408941 ■ Phone: +65 6.449.1133 ■ Fax: +65 6.242.9036 European Headquarters: Ganghofer Strasse 45, 82216 Gernlinden, Germany ■ Phone: +49 (0) 8142 4785 0 ■ Fax: +49 (0) 8142 4785 61 Asia Manufacturing: Hengqiao Road, Wujiang Economic Development Zone ■ Suzhou, Jiangsu Province, China 215200 ■ Phone: +86 512.82060807 ■ Fax: +86 512.8206 0808 ■ Website: www.kester.com ■