FL1601 – Water–base No–clean Lead–free Soldering Flux

Currently, the majority of fluxes rely on volatile organic compounds (VOCs) as solvents, which pose environmental and health risks due to their flammability and harmful effects. As a response to these issues, FL-1601 utilizes deionized water as a solvent instead of VOCs, offering a solution to the drawbacks associated with traditional solvents. This innovative approach allows for the use of various lead-free solders and delivers outstanding application results. FL-1601 represents a novel environmentally friendly lead-free solder and an optimal water-based flux that requires no cleaning.

Features and benefits

  • Low surface tension and high solderability and flowability, patented product.
  • Strong wettability and excellent ability of tin-penetration.
  • The residues after welding are spread evenly, high reliability.
  • Contains no VOC substances, no RoHS and other environmentally banned substances; non-flammable, safe to use, environmentally friendly flux.



It is applied to various lead-free solders and widely used in power source, communication devices, audio devices, refrigeration devices, medical appliances etc. It can be used with techniques of spraying, dipping and expanding foam.


Items Technical  Parameters Standards
Part Number FL-1601 /
Flux Classification ORLO J-STD-004A
Appearance Colorless transparent liquid /
Solid content ( wt  %) 3.00 ± 0.80 GB/T 9491-2002 5.4
Specific Gravity (20°C) 0.979 ± 0.010 /
Acid Valve ( mg KOH/g) 22.00 ± 5.00 JPC-TM-650 2.3.13
Expansion Rate (%) ³75 JIS-Z-3197
Chromate Paper Test PASS JPC-TM-650 2.3.33
Copper Mirror Corrosion PASS JPC-TM-650 2.3.32
Corrosion Test PASS JPC-TM-650 2.6.15
SIR (W) ³1.0×10⁸ JPC-TM-650
RoHS PASS RoHS Directive

Technical Documents

Technical Data Sheet

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