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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 FluxCored 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 Day 1 1.6*10 Ω 1.1*1010 Ω Day 4 1.2*1010 Ω 9.2*109 Ω Day 7 1.1*1010 Ω 8.6*109 Ω 10 Spread Test (typical): Tested to J-STD-004, IPC-TM-650, Method 2.4.46 Area of Spread mm2 (in2) Flux-Cored Solder Sn96.5Ag3.0Cu0.5 Sn63Pb37 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 https://www.kester.com for more information. Note: Core Size 50, 58 and 66 = 1.1, 2.2 and 3.3% flux core 48 Flux-Cored Wire Technical Data Sheet Issue: 17 May 2021 Page 2 of 4 TECHNICAL DATA SHEET Process Considerations Solder iron tip temperatures are most commonly between 371 to 400 °C (700 to 750 °F) for lead-free alloys. Heat both the land area and component lead to be soldered with the iron prior to apply the solder wire to the 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. 186 and NF372-TB are also available in Flux-Pens® for optimum board cleanliness. Cleaning 48 possesses excellent fluxing ability, the flux residue is non-corrosive and 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. A saponifier or cleaning agent specifically designed to clean a rosin-based flux is required to clean the residues. Please contact Kester Technical Support for further information. 48 Flux-Cored Wire Technical Data Sheet Issue: 17 May 2021 Page 3 of 4 TECHNICAL DATA SHEET Recycling Services We provide safe and efficient recycling services to help companies meet their environmental and legislative requirements and at the same time, maximize the value of their waste streams. Our service collects solder dross, solder scrap, and various forms of solder paste waste. Please contact your local sales representative for recycling capabilities in your area or link here. Storage, Handling and Shelf Life Storage must be in a dry, non-corrosive environment between 10 to 40 °C (50 to 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 shelf life determined by the alloy used in the wire. For alloys containing more than 70% lead, the shelf life is 2 years from the date of manufacture. Other alloys have a shelf life 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 and warning label before using this product. Safety Data Sheets are available at this link. Contact Information To confirm this document is the most recent version, please contact Assembly@MacDermidAlpha.com North America 109 Corporate Blvd. South Plainfield, NJ 07080, USA 1.800.253.7837 Europe Unit 2, Genesis Business Park Albert Drive Woking, Surrey, GU21 5RW, UK 44.01483.758400 Asia Pacific 8/F., Paul Y. Centre 51 Hung To Road Kwun Tong, Kowloon, Hong Kong 852.3190.3100 Also read carefully warning and safety information on the Safety Data Sheet. This data sheet contains technical information required for safe and economical operation of this product. READ IT THOROUGHLY PRIOR TO PRODUCT USE. Emergency safety directory assistance: US 1 202 464 2554, Europe + 44 1235 239 670, Asia + 65 3158 1074, Brazil 0800 707 7022 and 0800 172 020, Mexico 01800 002 1400 and (55) 5559 1588 DISCLAIMER: All statements, technical information and recommendations contained herein are based on tests we believe to be reliable, but the accuracy or completeness thereof is not guaranteed. No statement or recommendation shall constitute a representation unless set forth in an agreement signed by officers of seller and manufacturer. NO WARRANTY OF MERCHANTABILITY, WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY IS MADE. The following warranty is made in lieu of such warranties and all other warranties, express, implied, or statutory. Products are warranted to be free from defects in material and workmanship at the time sold. The sole obligation of seller and manufacturer under this warranty shall be to replace any noncompliant product at the time sold. Under no circumstances shall manufacturer or seller be liable for any loss, damage or expense, direct, indirect, incidental or consequential, arising out of the inability to use the product. Notwithstanding the foregoing, if products are supplied in response to a customer request that specifies operating parameters beyond those stated above, or if products are used under conditions exceeding said parameters, the customer by acceptance or use thereof assumes all risk of product failure and of all direct, indirect, incidental and consequential damages that may result from use of the products under such conditions, and agrees to exonerate, indemnify, defend and hold harmless MacDermid, Incorporated and its affiliates therefrom. No suggestion for product use nor anything contained herein shall be construed as a recommendation to use any product in a manner that infringes any patent or other intellectual property rights, and seller and manufacturer assume no responsibility or liability for any such infringement. © 2019 MacDermid, Inc. and its group of companies. All rights reserved. “(R)” and “TM” are registered trademarks of MacDermid, Inc. and its group of companies in the United States and/or other countries. 48 Flux-Cored Wire Technical Data Sheet Issue: 17 May 2021 Page 4 of 4