Solar flux for industrial solar module manufacturing
Emil Otto offers solar flux for soldering solar modules, tabber and stringer materials, and for joining solar cells. The products are designed to ensure stable solder joints, clean processes, and reliable electrical contacts in photovoltaic manufacturing.
Depending on the requirements, solar fluxes promote good wetting, controlled residue behavior, and reliable results at high processing temperatures. This makes them suitable for automated and manual soldering processes in the manufacture of modern photovoltaic modules.
Solar flux for solar modules, tabber, and stringer material
In solar module manufacturing, cell connectors, tabber and string materials, and metallic contact surfaces must be reliably soldered. The solar flux used aids in wetting the surfaces and helps establish stable electrical connections between the solar cells.
Emil Otto's solar fluxes are designed for typical applications in photovoltaic manufacturing. These include soldering solar modules, processing tabber and stringer materials, and joining individual solar cells. Depending on the process, different solid content levels, activators, and formulations can be used.
This allows solar fluxes to be selected to suit the process, material, and desired residue characteristics.
Catalog number
Product
Solids content
Application
Activators
Requirements for flux in photovoltaic manufacturing
Solar flux must be suitable for the specific manufacturing environment. Key factors include not only the solder joint and the material used, but also temperature control, application, drying, residues, and the requirements for the module’s long-term reliability.
Key selection criteria include:
| Criterion | Significance for the Process |
| Wetting | promotes consistent and reliable solder joints |
| Solids content | affects activity, residues, and process behavior |
| Activators | prepare the metal surfaces for soldering |
| Temperature stability | important for high process temperatures in module manufacturing |
| Residue behavior | essential for clean surfaces and reliable contacts |
| No-Clean compatibility | can reduce the amount of cleaning required after soldering |
| Material compatibility | important for solar cells, cell connectors, tabber and stringer materials |
| Process reliability | supports reproducible results in mass production |
The appropriate selection should therefore always be based on the application, the system, the temperature profile, and the quality requirements.
No-Clean solar flux for clean soldering processes
In industrial photovoltaic manufacturing, controlled residue behavior is particularly important. Residues must not interfere with the rest of the process and should not compromise the reliability of the electrical connection.
Emil Otto's solar fluxes are designed as "no-clean" products and leave no sticky residue. As a result, they can help reduce cleaning efforts and support stable process conditions in solar module manufacturing.
At the same time, the activators are designed for high processing temperatures, such as those that can occur during the manufacture of solar modules. This ensures reliable wetting and stable solder joints during the processing of solar modules, tabber and stringer materials, and cell connections.
For modern cell technologies such as TOPCon and heterojunction, gentle thermal process control can be particularly important. Emil Otto also offers “Fast-Dry” versions of its pure alcohol-based solar fluxes, which can accelerate drying processes and reduce heat input during the process.
Advantages of solar fluxes from Emil Otto
High wetting and excellent soldering results ensure stable connections and therefore a longer service life for the solar modules.
The fluxes are equally suitable for soldering solar modules as well as for tabber and stringer material.
Our Solar Flux products are halogen and solvent-free. This protects both the environment and the health of workers.
The high purity of the soldering flux ensures that there are no impurities that could impair the function of the solar cells.
Learn more about how Emil Otto implements sustainability in product development, production, and throughout the company.