HOW TO FIND THE RIGHT FLUX

The right choice of flux for wave and selective solder processes in electronics manufacturing is determined by different factors. What is essential in one manufacturing environment may be of much less importance in another. Our fluxes are just as multifaceted as our customers‘ requirements. Be it a waterbased or a conventional solvent-based flux, with or without resin, with or without certain substances due to special material combinations. Since 1879 the range of available fluxes for reliable soldering has constantly grown in line with the growing requirements.

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 EF-SERIES covers many of the manufacturing industry‘s requirements for liquid soldering fluxes by providing versatility and a large application area. the EF series has been developed for application with modern spray fluxing systems. Since the series encompasses fluxes with different activation strengths, it gives you the chance to select the optimum activation according to soldering and reliability requirements. While e.g. low activation may be selected for a full nitrogen tunnel wave soldering system, soldering with older equipment and on difficult surfaces requires a higher activation level.

Apart from the activity and the resulting soldering performance, the reliability of No-Clean fluxes and their residues after soldering are important factors for the selection of the right flux for the production process.

While the EF series is completely Halide Zero designed, it offers types with or without resin, with only traces of activator, up to broadband fluxes that fulfil all the requirements of current electronics manufacturing systems.

All of these fluxes ensure a high to very high degree of electrical safety with varying but low amounts of residues on soldered printed circuit boards.

In comparison with EF330 the flux EF350 with its small addition of resin raises the insulation resistance of the flux residues and concurrently reduces the formation of solder beads. The good activation of the flux EF350 provides a wide process window and can therefore obtain good results also in a selective soldering process.

The EF200 and EF210 show less activation and are well suited for soldering in nitrogen atmosphere as well as on some air soldering equipment, where they leave less residues on the PCBs due to their lower amount of solids.

The version EF270F was optimised for application with foam fluxing units. It contains well-balanced additives, which ensure a proper foam formation over a long time. This results in a perfect thin layer of flux and a safe application prior to a good wetting and safe formation of the solder joints.

During the development of the newest member of the EF series, the EF250, the reduction of flux residues in the soldering equipment and on the PCBs was one of the main goals while maintaining the very good wetting properties, known from the EF series of fluxes. Reduction of equipment cleaning and maintenance was achieved with the EF250 flux. The PCBs leave the soldering process in a very clean condition; the very low amount of flux residues passes all international test standards.

FLUX EF350 BIO

The halogen-free activated no-clean flux EF350 BIO guarantees an excellent wetting ability on different surfaces (e.g. OSP, Ni/Au, HAL, chem. Sn and chem. Ag) both with lead-free and lead-containing solder alloys.

EF350 BIO is a flux with an extremely wide process window. It can be used universally for wave soldering as well as for selective soldering due to its very good activity. This product is suitable for use in spray fluxers, micro drop fluxers, dipping processes and several other methods.

By using bio-ethanol in this version of the EF350, manufactured from straw with energy from renewable resources, the CO2 footprint is reduced by 70-90% compared to the conventional IPA-based flux version

The 500-6B is an active flux with high priority on the electrical safety of its residues. The solids contain activators and a high amount of rosin. This results in a higher residue level after soldering, but this is often accepted due to its very high electrical safety and insulation resistance. The flux 500-6B can be applied with all commonly installed fluxing systems.

The flux 500-17/1 can be perfectly used for pre-tinning of enameled copper wires at higher temperatures as well as different other delicate soldering applications. It has been developed especially for dip soldering and its high amount of solids ensures that there is always enough active flux left at the component to be soldered, even at elevated preheat temperatures or high temperatures of a dip-solder bath. There is enough activity to achieve an even pre-tinning and good soldering results

Some slightly older soldering equipment is not well equipped in preheating for the use of VOC-free fluxes. The heat transfer rate or the length of some equipment is not high or long enough. What to do if you need to reduce your VOC emissions? The usage of semi-aqueous fluxes might be an option. With this family of fluxes the VOC emissions can be reduced up to 50% and your existing equipment can be further used. Lower flash points for easier transport and storage may also apply on some of these fluxes. They are all based on resin- and halide-free formulations.

Already some years in our product range of the semi-aqueous fluxes the HW139 with 2.5% solids had proven his wide process window, easy application and good soldering results in many different applications.

As the newest development in this segment of fluxes we introduce the HW240, which differs from the other ones due to its unique activation system. This ensures good soldering results combined with very low amounts of residues.

<p>The flux WF300 is available in <a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf300s-25l-1.html">spraying</a> and <a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf300f-25l-1.html">foaming</a> variations. With a comparatively high solid content for a spray flux, the applicable flux volume can be reduced considerably and still results in reliable soldering. Therefore you can reduce the required amount of energy for drying the board prior to soldering as well as the volume of required flux.</p><p><a href="https://www.stannol.de/en/products/flux/detail/wasserbasierend-loetflussmittel-wf130-25l.html">WF130</a> and WF131 are our newest water based ORL0 flux developments. They both come with perfect soldering results and leave very small amounts of electrical safe residues combined with extremely low corrosive potential. These both water based flux are true halogen “Zero” fluxes and contain no VOCs. Due to the very low corrosive potential these both can be classified as L0, not often seen with water based fluxes.</p><p>Main difference of the WF131 is a further reduction in residue level, with a very minor compromise of a slightly smaller process window. Introducing water-based fluxes requires a comprehensive assessment of the application. Our application specialists will gladly support you and provide expert 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 spraying and foaming variations. With a comparatively high solid content for a spray flux, the applicable flux volume can be reduced considerably and still results in reliable soldering. Therefore you can reduce the required amount of energy for drying the board prior to soldering as well as the volume of required flux.

WF130 and WF131 are our newest water based ORL0 flux developments. They both come with perfect soldering results and leave very small amounts of electrical safe residues combined with extremely low corrosive potential. These both water based flux are true halogen “Zero” fluxes and contain no VOCs. Due to the very low corrosive potential these both can be classified as L0, not often seen with water based fluxes.

Main difference of the WF131 is a further reduction in residue level, with a very minor compromise of a slightly smaller process window. Introducing water-based fluxes requires a comprehensive assessment of the application. Our application specialists will gladly support you and provide expert advice on site

Today’s selective soldering processes places special demands on the flux required. Of course, it is often the case that a flux developed for wave soldering also works on selective soldering systems. But does it meet the growing demands? The SF1000 from the Stannol SF series of fluxes for safe selective soldering is the next flux which has been adapted to these special requirements. Large process window, technical purity, lower thermal stress with highest electrical safety were the keywords in 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 any further consultation on which solder wire 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 catalog.