The selection of the right flux for wave and selective soldering processes in electronics manufacturing depends on various factors. Not only the respective area of application, 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.

Our product selector supports you in the selection process: First define your specific area of application in the "Selection guide" area. Then you can select the desired flux characteristics. Afterwards, the product overview shows you which flux is best suited for your area of application.

Stannol Product Selector

The Selector Guide on the left gives you the chance to choose different characteristics and to find a product from our range. If you are not familiar with some of the terms, you can use the information box to display a brief explanation of the selected item.

Selector Guide

The electronics manufacturing industry places high demands on modern flux systems. The products of the 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, has been especially developed for application with current spray flux systems.

Activations for every application

The EF fluxes are available with different activation levels. This means that the optimum activation can be selected for each process – depending on solderability and reliability requirements. For a full-tunnel nitrogen system, for example, a very low activation can be considered. For soldering on older systems and on surfaces that are difficult to solder, a higher activation should be used.

High to very high electrical safety

The reliability of the No-Clean flux and its residues after soldering also play an important role in selecting the right flux. 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 production 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.

The EF fluxes in comparison

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

The EF250 flux is the latest product in the EF series. The most important development criterion here: to minimise contamination by the flux. The use of the EF250 not only reduces the cleaning effort of the system, but also the residues on the assembly itself – while at the same time ensuring safe wetting and complying with common test criteria for electrical safety.

Flux EF350 Bio

The halogen-free activated No-Clean flux EF350 Bio has a wide working range and can be used universally. It guarantees excellent wetting properties on different surfaces (for example OSP, Ni/Au, HAL, chem. Sn and chem. Ag) with both lead-free and lead-containing solder alloys. EF350 Bio can be used for wave soldering as well as for selective soldering due to its very good activity. The flux is well suited for use in spray fluxers, but the use of the product in foam fluxers is also possible. By using bio-ethanol as part of the greenconnect series, the CO2 footprint is reduced by up to 90 percent with the EF350 Bio in contrast to conventional alcohol-based fluxes.

Flux 500-6B is a well activated flux where the electrical safety of the residues is paramount. The solid content is made up of activators and a relatively high proportion of resins. This produces an increased amount of residues – but these in turn ensure extremely high insulation resistances. Flux 500-6B can be used with all common types of application.

Flux 500-17/1

The tinning of enamelled copper wires can be carried out safely with flux 500-17/1. Due to its very high solids content, this flux, which was specially developed for the dip soldering process, guarantees that there is still enough active flux on the component to be soldered, even at high dip 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, water-based fluxes cannot be processed satisfactorily on older soldering systems because the preheating is too short or too weak. In order to nevertheless 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 resin- and halogen-free.

Fluxes HW139 and HW240

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

<p>The flux WF300 is available in variants for spraying (<a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf300s-25l-1.html">WF300S</a>) and foaming (<a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf300f-25l-1.html">WF300F</a>). With a relatively high solid content for spray fluxes, the volume of flux to be applied can be greatly reduced for reliable soldering. The energy input required to pre-dry the flux can be minimised as well as the flux consumption.</p><h3>Fluxes WF130 and WF131</h3><p>The fluxes <a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf130-25l.html">WF130</a> and WF131 are our latest developments of water-based ORL0 fluxes. Both achieve perfect soldering results and leave very low amounts of electrically harmless residues in combination with an extremely low corrosion potential. The two products are true halogen-free fluxes and contain no VOCs. Due to the very low corrosive potential, both can be classified as L0 – this is rarely possible with water-based fluxes. The main difference between the two fluxes: WF131 leaves slightly less residue than WF130, but the latter has a slightly larger process window.</p><p>The introduction of water-based fluxes often requires a comprehensive evaluation of the current system technology and application. Our application specialists will be happy to support you and provide competent advice on site.</p>
The WF130 and WF131 are our latest developments of water-based ORL0 fluxes

Water-based fluxes

The flux WF300 is available in variants for spraying (WF300S) and foaming (WF300F). With a relatively high solid content for spray fluxes, the volume of flux to be applied can be greatly reduced for reliable soldering. The energy input required to pre-dry the flux can be minimised as well as the flux consumption.

Fluxes WF130 and WF131

The fluxes WF130 and WF131 are our latest developments of water-based ORL0 fluxes. Both achieve perfect soldering results and leave very low amounts of electrically harmless residues in combination with an extremely low corrosion potential. The two products are true halogen-free fluxes and contain no VOCs. Due to the very low corrosive potential, both can be classified as L0 – this is rarely possible with water-based fluxes. The main difference between the two fluxes: WF131 leaves slightly less residue than WF130, but the latter has a slightly larger process window.

The introduction of water-based fluxes often requires a comprehensive evaluation of the current system technology and application. Our application specialists will be happy to support you and provide competent advice on site.

Selective soldering processes place special demands on the flux required. Although fluxes developed for wave soldering also work on selective soldering systems, there is potential for improvement that must be exploited. SF1000 – from the Stannol flux series for safe selective soldering – is the first flux available that has been adapted for these special technological requirements. In addition, it meets the growing demands for environmental protection. A large process window, technical purity, lower thermal stress with the highest electrical safety were the characteristic data during the development – this was successfully implemented with the alcohol-based SF1000.

Flux overview

Flux

DIN EN

ISO 9454-2

J-STD-004 J-STD-004B

Application

method*

VOC-

Content

Solid-

content %

Application

GREEN-

CONNECT

EF-SERIES

EF200

2.2.3.A

ORL0

S

High

2,0

Wave, Selective

EF210

2.2.3.A

ORL0

S

High

2,1

Wave, Selective

EF250

2.2.3.A

ORL0

S

High

2,5

Wave, Selective

EF270

2.2.3.A

ORL0

S

High

2,7

Wave, Selective

EF270F

2.2.3.A

ORL0

SF

High

2,7

Wave, Selective

EF330

2.2.3.A

ORL0

S

High

3,3

Wave, Selective

EF350

2.2.3.A

ORL0

S

High

3,5

Wave, Selective

EF350 Bio

2.2.3.A

ORL0

S

High

3,5

Wave, Selective

WATER BASED

WF130

2.1.3.A

ORL0

S

Free

3,0

Wave, Selective

WF131

2.1.3.A

ORL0

S

Free

2,6

Wave, Selective

WF300F

2.1.3.A

ORM0

F

Free

4,6

Wave

WF300S

2.1.3.A

ORM0

S

Free

4,6

Wave

SPECIAL FLUX

SF1000

2.1.3.A

ORL0

S

High

2,5

Selective, Wave

500-6B

1.1.3.A

ROL0

S, F, T, P

High

6,0

Wave, Selective

500-17-1

1.1.3.A

ROL0

S, F, T, P

High

15,0

Tauchen

500-3431BF

2.2.3.A

ORL0

S

High

4,4

Wave

900-7-1H

2.1.2.A

ORM1

S

High

1,7

Tauchen

HW139

2.2.3.A

ORM0

S

Low

2,5

Wave, Selective

HW240

2.2.3.A

ORL0

S, F

Low

2,4

Wave, Selective

X33-08i

2.2.3.A

ORL0

S

High

2,0

Wave, Selective

L2

2.2.3.A

OR L0

S, F, T, P

High

2,0

Wave, Selective

P770

2.2.3.A

OR L0

S, F

High

2,3

Wave, Selective

P981

1.2.3.A

RE L0

S, F

High

2,7

Wave, Selective

*Application methods: S Spraying / F Foaming / D Dipping / B Brushing

We are happy to assist you

If you need further advice on which flux is right for you,
please feel free to contact us.

STANNOL MAIN CATALOGUE

You can find more information on the respective topic and an overview of our product range in our main catalogue.