Selector Guide


Application Method

Please select how the solder paste will be applied. Stencil printing with printing machines as well as dispensing with automatic and manual processes are provided as standard methods. 

Soldering Method

It is specified here how the heat is transmitted to the assembly board. You can choose between “reflow oven” or “vapour phase”.



The use of lead containing solder is severely restricted by legislation in the electronics manufacturing. Lead containing solder is still allowed in some application areas. It is permitted in the DIY sector if the soldered product is either not electronics or the electronics are not brought into the market, too.

Alloy Composition

The solders are characterised by different metal compositions. The alloy composition describes the proportions in which the metals are present in the alloy. As a result, physical basic data of the alloy such as strength, melting point and similar are defined.

DIN ISO 9453

The standard ISO 9453 defines which amount of impurities is permitted to be present in the alloys. 

Melting range

Various alloys are eutectic; these show a defined melting point. Other alloys only show a melting range. This is dependent on the composition of the alloy. For non-eutectic alloys with a melting range, the lower value indicates the solidus point; the solder is solidified below this temperature. The upper value indicates the liquidus temperature; the solder is completely liquid above this temperature. In between these temperatures, the solder is paste-like. 

Powder Particle Size

For the solder pastes, the metals are available in the form of a solder powder with precisely defined diameters. The requirement to use one of the available classes for particle diameters arises from the size of the openings in the printing stencils and also from the thickness of the stencil. Standard solder pastes are usually available in the powder particle sizes 3 (particle diameter of 25-45 µm) and 4 (particle diameter of 20-38 µm). Finer particle diameters such as type 5 (15-25 µm) are only available for some of the solder pastes.

Metal Content

The metal content of solder pastes is always specified as % by weight. This content determines whether a solder paste is processed for printing or dispensing. 

Flux Characteristics


Activation describes the capability of removing the existing oxide layer prior to wetting. The higher the activation, the better the wetting and spreading of the solder.  The activation levels "High", "Medium" and "Low" can be selected.


Sometimes the flux residues must be cleaned after soldering to increase the electric reliability. The recommend cleaning method can be found in the data sheets of the products.

You can choose "Necessary" or "No-Clean" as possible selection criteria. No-Clean solder paste leaves electrically safe residues which can remain on the assembly.


If a flux contains halogens, it is usually higher activated than a halogen-free flux. Activated fluxes containing halogens are usually distinguished during the soldering process by better wetting. Halogen-free fluxes and their residues are usually considered as significantly less susceptible to corrosion on the solder product. This is usually only correct at first glance. The general conditions must always be considered precisely for the "Halogenated Yes/No" question. Many soldering methods do not need any halogenated activators; for some solder processes, this activator group is very helpful or even makes soft soldering possible at all.

DIN EN 61190-1

The standard DIN EN 61190-1 to 3 classifies fluxes according to their type and activity. For example, the fluxes are designated as ROL0 or REL1. For the electrical industry, it is also assessed afterwards which influence the flux residue has on the fitness for purpose of the assembly. The difference from the standard J-STD-004 consists of the amount of halogens permitted to be contained in the flux.

Flux J-STD-004

The standard J-STD-004 classifies fluxes according to their type and activity.  

Avaible Delivery Forms


The item "Container" shows which packaging size is available for this product.


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.

On the right side you find a product overview of our product range. Products which do not meet the selected characteristics are shown brightened and you cannot choose them any longer.

The reset button deletes your input back to the starting position.