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Water-based flux WB-35/SOX (multiflux)

Recommended method of application
Wave and selective soldering

No Clean-Flux, water-based
Di-carboxylic acids, VOC-free, resin-free, halogen-free (WEEE/RoHS compliant)
Type ISO-9454: 2131 \ DIN EN 61190-1-1 (ORL0)

Cat.-No. 2118

Technical Data

Appearance: colourless, clear liquid
Hazardous goods: No
VOC: 0.0 %
Solids content: 3.5 wt.-%
Acid number: 28 – 32 mg KOH/g
Halogen-free: Yes
Resiny: No
Activators: di-carboxylic acids, VOC-free, resin-free, halogen-free
Solvents: water-based
Flash point: non-flammable
Available as concentrate: No
Durability: 12 months


The WB-35/SOX is pure water-based and has been developed to be used with wave soldering machines. It is ecologically harmless and non-flammable. The WB-35/SOX with its soldering-related properties is at least just as good as comparable alcohol-based soldering fluxes. Application takes place using a spray fluxer. It has a high level of activity.
Practice has shown that no washing is needed for PCBs properly soldered with WB-35/SOX.

Customer added value

  • Non-flammable (no legal restrictions for transport, storage and handling)
  • Very good soldering properties (capillarity, wetting)
  • Broad process window (high thermal stability, good activity over a long interval)
  • Very good residue behaviour (optically very clean, high SIR)

Packaging units

Canister: 20 l