® 985M Low-Solids No-Clean Flux Pen ® Product Description Kester 985M is a low solids, halide-free, no clean Flux Pen® that is specifically designed for rework of conventional and surface mount circuit board assemblies. 985M was developed for use with both traditional tin-lead and lead-free solder alloys. Kester 985M exhibits improved soldering performance to minimize solder bridges (shorts) during rework operations. This flux is suitable for automotive, computer, telecommunications and other applications where reliability considerations are critical. The surface insulation resistance on soldered boards is higher than that provided by typical organic water-soluble fluxes. Performance Characteristics: • • • • • Improves soldering performance Eliminates the need and expense of cleaning Non-corrosive tack-free residues Classified as ROL0 per J-STD-004 Compliant to Bellcore GR-78 Physical Properties Specific Gravity: 0.805 ± 0.005 Antoine Paar DMA 35 @ 25°C Percent Solids (theoretical): 3.60 Acid Number (typical): 20.0 mg KOH/g of flux Tested by potentiometric titration 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: Pass Tested to J-STD-004, IPC-TM-650, Method 2.3.33 Chloride and Bromides: None Detected Tested to J-STD-004, IPC-TM-650, Method 2.3.35 Fluorides by Spot Test: Pass Tested to J-STD-004, IPC-TM-650, Method 2.3.35.1 SIR, IPC (typical): Pass Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3 Day 1 Day 4 Day 7 Blank 951 1.3 ´ 10 W 9.7 ´ 109 W 8.2 ´ 109 W 7.3 ´ 109 W 1.1 ´ 1010 W 1.1 ´ 1010 W 10 985M Flux Pen® Application Notes Flux Application: Kester 985M is applied to circuit boards via Flux Pen® for rework of printed wire assemblies. Process Considerations: Kester 985M should only be applied to areas that will be fully heated by the soldering iron or other reflow tool. Care should be taken to avoid flooding the assembly. The surface tension has been adjusted to help the flux form a thin film on the board surface allowing rapid solvent evaporation. Cleaning: Kester 985M flux residues are non-conductive, non-corrosive and do not require removal in most applications. Storage and Shelf Life: Kester 951 is flammable. Store away from sources of ignition. Shelf life is 2 years from date of manufacture when handled properly and held at 10-25°C (50-77°F). Health & Safety: This product, during handling or use, may be hazardous to health or the environment. Read the Material Safety Data Sheet and warning label before using this product. World Headquarters: 800 W. Thorndale Avenue, Itasca, Illinois, 60143 USA Phone: (+1) 847-297-1600 • Email: [email protected] • Website: www.kester.com Asia Pacific Headquarters 500 Chai Chee Lane Singapore 469024 (+65) 6449-1133 [email protected] European Headquarters Zum Plom 5 08541 Neuensalz Germany (+49) 3741 4233-0 [email protected] Japanese Headquarters 20-11 Yokokawau 2-Chome Sumida-Ku Tokyo 130-0003 Japan (+81) 3-3624-5351 [email protected] The data recommendations presented are based on tests, which we consider reliable. Because Kester has no control over the conditions of use, we disclaim any responsibility connected with the use of any of our products or the information presented. We advise that all chemical products be used only by or under the direction of technically qualified personnel who are aware of the potential hazards involved and the necessity for reasonable care in their handling. The technical information contained herein is consistent with the properties of this material but should not be used in the preparation of specifications as it is intended for reference only. For assistance in preparing specifications, please contact your local Kester office for details. Rev: 27Apr2011