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for wave and selective soldering processes


for wave and selective soldering processes

Our Product Selector – how to find the right flux

The selection of the right flux for wave and selective soldering processes in electronics manufacturing depends on various factors. For example, not only the respective application area, but also the application or soldering process used must be taken into account. Depending on the area of application, the parameters can vary greatly and must therefore be evaluated individually.

To give you a better overview, we have developed our innovative product selector. This provides you with an initial overview of our most important fluxes.

First define your specific area of application in the "Selector Guide" section. Then you can specify the desired flux properties. Afterwards, the product overview will show you which flux is best suited for your area of application.

Our fluxes are available in standard containers as 2.5-liter, 10-liter and 25-liter canisters as well as 200-liter barrels or in special sizes – we are happy to help you find the right product.


Selector Guide


Lead-free solder pastes

EF350 Bio

The halogen-free activated No-Clean flux EF350 Bio guarantees an excellent wetting ability on different surfaces (for example OSP, Ni/Au, HAL, chem. Sn and chem. Ag) with both lead-free and lead-containing solder alloys.

The EF350 Bio is universally applicable – it can be used in wave soldering as well as selective soldering. The EF350 Bio is well suited for use in spray fluxers.

The use of bio-ethanol reduces the carbon fooprint compared to conventional alcohol-based fluxes. Important for our customers: Extensive tests have proven that a 1:1 exchange of the flux is possible without changing the process parameters.

Water based fluxes


Stannol's environmentally friendly, water-based fluxes can reduce the carbon footprint by 90 percent. WF300S is a halogen-free, low-solids flux developed primarily for consumer electronics manufactured in regular or nitrogen atmospheres. WF300S has been specifically optimised to reduce solder beads between adjacent connections. The innovative flux also works extremely effective on poorly solderable surfaces, such as oxidised copper.

WF130 and WF131

WF130 and WF131 are developments of water-based ORL0 fluxes. Both deliver perfect soldering results and leave very low amounts of electrically harmless residues in combination with an extremely low corrosion potential. These two water-based fluxes are halogen-free and contain no VOCs. Due to the very low corrosive potential, both can be classified as L0, which is not often possible with water-based fluxes.

The main difference of WF131 is a further reduction in residue levels, with the small trade-off of a slightly smaller process window. The introduction of water-based fluxes often requires a comprehensive evaluation of current equipment technology and application. Our team will be happy to support you in this process and provide competent advice on site.

Bio flux for selective soldering

SF1000 Bio

Stannol soldering flux SF1000 Bio was especially developed for selective soldering of electronic assemblies. The low solids
content in combination with specially tailored halogen-free activation results in excellent wetting ability on a wide variety of
surfaces (e.g. OSP, Ni/Au, HAL), even with lead-free soldering alloys. This flux can also be used for other soldering processes
such as wave and dip soldering. Compared to conventional alcohol-based fluxes, the carbon footprint is reduced.

Solar Fluxes

EF160 Bio PV and EF180 Bio PV

The No-Clean fluxes EF160 Bio PV and EF180 Bio PV were specially developed for use in the photovoltaic module industry and meet all the requirements of the industry. The fluxes are halogen- and resin-free as well as low in solids, making them particularly suitable for solar module production. The EF180 Bio PV has a slightly higher solids content in comparison and a slightly stronger activation than the EF160 Bio PV.

Both fluxes provide equally good solderability in module assembly processes for soldering by IR and convection. They can be applied and soldered by hand to the ribbon as well as in tabber/stringer soldering systems using spray fluxers. The precisely formulated activator systems leave no visible residue after soldering. The innovative fluxes are also part of our greenconnect series: they have a 95 percent bio-based content in accordance with DIN EN 16785-2. By using bio-ethanol, the carbon footprint can be reduced.


EF200 Bio PV

EasyFlux EF200 Bio PV has been specially developed for use on solar cells and other sensitive surfaces. Due to the halogen-free activation, an excellent wetting ability is achieved. In addition, it leaves hardly any visible residue. This makes EF200 Bio PV the ideal choice for applications where absolute surface cleanliness is required. EF200 Bio PV is part of our greenconnect series and helps to significantly reduce CO2 emissions through the use of bio-ethanol.

Electronics Fluxes

Today, the electronics manufacturing industry places very high demands on modern flux systems. The products of our EF series meet these requirements, not least due to their great variety and wide range of applications. A large part of the series, for example, was developed specifically for application with modern spray flux systems.

Activations for every application

EF fluxes are offered in different levels of activation. This means that the ideal activation can be selected for each process – depending on the requirements for solderability and reliability. For full tunnel nitrogen systems, for example, a very low activation can be considered. For soldering on older systems and on surfaces that are difficult to solder, on the other hand, a higher activation should be used.

High to very high electrical safety

The reliability of the No-Clean fluxes and their residues after soldering also play an essential part in selecting the right flux. Thus, within the completely halogen-free EF series, fluxes can be found both with and without resin or with the smallest amounts of activator up to very broadband fluxes. Thus, all requirements of current electronics manufacturing can be covered. The EF fluxes have in common that a high to very high electrical safety is guaranteed with varying small residue quantities on the soldered PCBs.

Our electronics fluxes in comparison

In direct comparison to the flux EF330, the flux EF350 increases the insulation resistance of the flux residues due to a low addition of resins and at the same time reduces the formation of solder beads. The EF200 series fluxes are weaker activated and show their strengths in full tunnel nitrogen systems, as they leave less residue on the PCB due to their lower solids content. The EF270F flux is the optimised variant for application by foam fluxer. It is characterised above all by a fine-pored foam crown.

When developing the EF250 flux, the most important criterion was to minimise contamination by the flux. Using EF250 not only reduces the amount of cleaning required in the system, but also the residues on the assembly itself – while at the same time ensuring reliable wetting and complying with common test criteria for electrical safety.

Special Fluxes

AK-1 Bio

The halogen-free No-Clean flux AK-1 Bio was especially developed for cable tinning, tinning on component connections, soldering on copper or copper-passivated surfaces. It is based on environmentally friendly bio-ethanol and complements our greenconnect series.



The tinning of enameled copper wires can be carried out safely with flux 500-17/1. The flux, which was specially developed for the dip soldering process, guarantees through its very high solids content that sufficient active flux is still present on the component to be soldered even at high solder bath temperatures. Even if parts of the flux are lost due to the high temperatures in the solder bath, a good soldering result is achieved.

Semi-Aqueous Fluxes

Often, the water-based fluxes cannot be processed satisfactorily on some older soldering systems because the preheating is too short or too weak. In order to still significantly reduce the proportion of VOC emissions, fluxes can be used whose solvent is a mixture of water and alcohols. This group of fluxes is characterised by lower flash points and a 50 percent reduction in VOC content compared to alcohol-based fluxes. They are also free of resins and halogens.

HW139 and HW240

The semi-aqueous flux HW139 with 2.5 wt.% solids has already proven itself for many years in different soldering tasks. It is also easy to apply by means of a spray fluxer. As a newer development, HW240 ensures good soldering results with the same high soldering quality and wetting ability. At the same time, residue levels are greatly reduced due to a unique activator combination.

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