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Solar flux SOLAR FLUX-EO-S-012

Recommended method of application
Soldering of solar modules, tabber and stringer material as well as the connecting of cells

No Clean-Flux especially for the solar industry
Di-carboxylic acids, halogen-free, rosin-free, synthetic resin (WEEE/RoHS compliant)
Type ISO-9454: 2231 (2.2.3.A) // DIN-EN 61190-1-1 (acc. J-STD-004B) (IEC ORL0)

Cat.-No. 6212
Emil Otto SOLAR FLUX-EO-S-012 No Clean-Flux especially for the solar industry

Technical Data

Appearance/smell: colourless, transparent liquid
Solids content: 2.0 wt.-%
Density at 20 °C: 0.9 – 1.0 g/ml
Acid number: 15 – 19 mg KOH/g
Activators: Di-carboxylic acid complex, halogen-free, synthetic resin
Solvents: water with added alcohol
Additive: wetting agents, alcohol compound <15 %
VOC: 15 %


This flux has been specially developed for solar technology, in particular for soldering solar modules, tabber and stringer material
as well as connecting cells. EO-S-012 is a No Clean-Flux, halogen-free formulated and optimized for use in wave, selective and manual soldering processes. It is based on organic, rosin-free, activating additives in a combination specially tuned to the thermal requirements of the wave
soldering process with lead and lead-free solders. EO-S-012 contains small amounts of special alcoholic additives for stabilization and improved drying times compared to conventional water-based fluxes. The Flux was mainly developed for low-melting processes (Bi-solders). EO-S-012 leaves no sticky residue. The activators are specially designed for the higher temperatures that are required in the manufacture of solar modules without affecting their effectiveness. The application can be carried out by any usual application method (except foams). EO-S-012 is totally free from corrosion action

Instructions for use:
Sprayfluxing: If possible, try at first a quantity of 30 – 50 ml/min and observe the distribution of the flux. After that, correct the quantity. Air pressure: 18 – 20 l/min.
Preheating: Entering the solder wave, the temperature on the topside of the pasteboards should be 80 – 110 °C, dependent on type of boards, layout etc. In case of using lead-free solders, preheating temperatures of 100 – 125 °C on the topsides are possible.

Safety instructions: Please refer to the current MSDS
This flux is very versatile and OPS-compatible. There are good results for manual, wave and selective soldering as well as for cable assembly / wire tinning. The general rule of applying fluxes applied in principle as low as possible also applies to this product.

Packaging units

Canister without grommet: 5 l, 20 l