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TECHNICAL DATA SHEET 2331-ZX Flux-Pen® Organic Water Soluble Flux-Pen for Leaded and Lead-free Alloys Product Description Kester 2331-ZX Flux-Pen is designed for leaded and lead-free rework of conventional and surface mount circuit board assemblies. 2331-ZX Flux-Pen is an innovation in organic acid water soluble flux chemistry for soldering circuit board assemblies. This unique, neutral pH chemistry flux provides the best ionic cleanliness of any organic water soluble flux available to the electronics industry. This popular flux has been used for soldering critical assemblies in the telecommunications, computer and other industries. No offensive odors will be emitted during soldering. 2331-ZX Flux-Pen will not create excessive foaming in standard water cleaning systems. 2331-ZX Flux-Pen has good soldering properties for improved productivity without sacrificing reliability of the assembly. This flux does not attack properly cured solder masks or FR-4 epoxy-glass laminate. 2331-ZX Flux-Pen is not detrimental to the surface insulation resistance of the soldered assembly. Use of this flux minimizes cleaning costs while complying with environmental regulations. Performance Characteristics:  High activity  Chemically compatible with most solder masks and board laminates  pH Neutral Chemistry  Classified as ORH1 per J-STD-004 RoHS Compliance This product meets the requirements of the Restriction of Hazardous Substances (RoHS) Directive, 2015/863 for the stated banned substances. Physical Properties Specific Gravity: 0.899 ± 0.005 Anton Paar DMA @ 25 °C Percent Solids (Theoretical): 33% Tested to J-STD-004, IPC-TM-650, Method 2.3.34 Reliability Properties Copper Mirror Corrosion: High Tested to J-STD-004, IPC-TM-650, Method 2.3.32 2231-ZX Flux-Pen Technical Data Sheet Issue: 08 January 2021 Page 1 of 3 TECHNICAL DATA SHEET Corrosion Test: High 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 Chloride & Bromide: 2.2% 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 Surface Insulation Resistance (SIR) IPC (Typical): Pass Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3 Blank 2331-ZX Day 1 1.2 ×1010 Ω 3.4 × 108 Ω Day 4 8.7 ×109 Ω 1.4 × 109 Ω Day 7 8.6 ×109 Ω 1.8 × 109 Ω Flux Application 2331-ZX Flux-Pen is applied to circuit boards via Flux-Pen for rework of printed wire assemblies. Process Considerations 2331-ZX Flux-Pen 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 Flux residues after soldering must be removed as they are conductive and corrosive. No neutralizer, saponifiers or detergents are necessary in the water wash system for complete removal of flux residues. It is not recommended to use high mineral content tap water. Otherwise, tap, deionized or softened water may be used for cleaning. The optimum water temperature is 54 to 66 °C (130 to 150 °F), although lower temperatures may be sufficient. 2231-ZX Flux-Pen Technical Data Sheet Issue: 08 January 2021 Page 2 of 3 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 2331-ZX Flux-Pen is flammable. Store away from sources of ignition. Shelf life is 2 years from the date of manufacture when handled properly and held at 10 to 25 °C (50 to 77 °F). The cap must be in place when not being used. 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. 2231-ZX Flux-Pen Technical Data Sheet Issue: 08 January 2021 Page 3 of 3