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Alcohol- and water-based flux SD-35 (multiflux)

Recommended method of application
Wave and selective soldering, manual and repair soldering, dip soldering

No Clean-Flux, alcohol- and water-based
Di-carboxylic acids, resin-free, halogen-free (WEEE/RoHS compliant)
Type ISO-9454: 2131 \ DIN EN 61 190-1-1 (ORL0)

Cat.-No. 6335

Technical Data

Appearance: colourless, clear liquid
Hazardous goods: No
VOC: 66 %
Solids content: 3.5 wt.-%
Acid number: 28 – 34 mg KOH/g
Halogen-free: Yes
Resiny: No
Density at 20 °C: 0.86 – 0.88 g/ml
Activators: di-carboxylic acids, resin-free, halogen-free
Solvents: short-chain alcohols and water
Flash point: 12 °C
Available as concentrate: No
Durability: 12 months


The SD-35 is a halogen-free soldering flux with a reduced alcohol component. It has been developed for selective and wave soldering processes. It has a solids content of 3.5 wt.-% and is characterized by excellent soldering properties. The chosen combination of alcohol and water makes it possible to make optimum use of the advantages of both solvents. The evaporation behaviour of SD-35 is considerably better than with water-based fluxes. Therefore it is also suitable for manual and dip soldering and thereby fulfills all the requirements of a multiflux.
Practice has shown, that with the correct application, no washing of assembled printed circuit boards soldered with this flux is needed. The surfaces of the soldered printed circuit boards are very clean after the soldering process.

Customer added value

  • Wide range of applications (multiflux)
  • 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